deleted file mode 100644
--- a/intl/icu-patches/bug-1172609-icu-fix.diff
+++ /dev/null
@@ -1,81 +0,0 @@
-This patch is taken from the version of ICU in Google's Chromium.
-
-See: https://chromium.googlesource.com/chromium/deps/icu/+/10834e84d250eb31a73496bfdb7923eaa43ead51
-
-diff --git a/intl/icu/source/common/putil.cpp b/intl/icu/source/common/putil.cpp
---- a/intl/icu/source/common/putil.cpp
-+++ b/intl/icu/source/common/putil.cpp
-@@ -965,16 +965,25 @@ static char* searchForTZFile(const char*
-                 }
-             }
-         }
-     }
-     closedir(dirp);
-     return result;
- }
- #endif
-+
-+U_CAPI void U_EXPORT2
-+uprv_tzname_clear_cache()
-+{
-+#if defined(CHECK_LOCALTIME_LINK) && !defined(DEBUG_SKIP_LOCALTIME_LINK)
-+    gTimeZoneBufferPtr = NULL;
-+#endif
-+}
-+
- U_CAPI const char* U_EXPORT2
- uprv_tzname(int n)
- {
-     const char *tzid = NULL;
- #if U_PLATFORM_USES_ONLY_WIN32_API
-     tzid = uprv_detectWindowsTimeZone();
- 
-     if (tzid != NULL) {
-diff --git a/intl/icu/source/common/putilimp.h b/intl/icu/source/common/putilimp.h
---- a/intl/icu/source/common/putilimp.h
-+++ b/intl/icu/source/common/putilimp.h
-@@ -478,16 +478,22 @@ U_INTERNAL int32_t  U_EXPORT2 uprv_timez
-  *   tzname(1)  Three-letter DST zone name derived from TZ environment
-  *              variable.  E.g., "PDT". If DST zone is omitted from TZ,
-  *              tzname(1) is an empty string.
-  * @internal
-  */
- U_INTERNAL const char* U_EXPORT2 uprv_tzname(int n);
- 
- /**
-+ * Reset the global tzname cache.
-+ * @internal
-+ */
-+U_INTERNAL void uprv_tzname_clear_cache();
-+
-+/**
-  * Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
-  * This function is affected by 'faketime' and should be the bottleneck for all user-visible ICU time functions.
-  * @return the UTC time measured in milliseconds
-  * @internal
-  */
- U_INTERNAL UDate U_EXPORT2 uprv_getUTCtime(void);
- 
- /**
-diff --git a/intl/icu/source/i18n/timezone.cpp b/intl/icu/source/i18n/timezone.cpp
---- a/intl/icu/source/i18n/timezone.cpp
-+++ b/intl/icu/source/i18n/timezone.cpp
-@@ -453,16 +453,18 @@ TimeZone::detectHostTimeZone()
-     int32_t rawOffset = 0;
-     const char *hostID;
- 
-     // First, try to create a system timezone, based
-     // on the string ID in tzname[0].
- 
-     uprv_tzset(); // Initialize tz... system data
- 
-+    uprv_tzname_clear_cache();
-+
-     // Get the timezone ID from the host.  This function should do
-     // any required host-specific remapping; e.g., on Windows this
-     // function maps the Date and Time control panel setting to an
-     // ICU timezone ID.
-     hostID = uprv_tzname(0);
- 
-     // Invert sign because UNIX semantics are backwards
-     rawOffset = uprv_timezone() * -U_MILLIS_PER_SECOND;

--- a/intl/icu-patches/bug-1228227-bug-1263325-libc++-gcc_hidden.diff
+++ b/intl/icu-patches/bug-1228227-bug-1263325-libc++-gcc_hidden.diff
@@ -1,16 +1,16 @@
 Limit libstdc++ workaround to not upset libc++ with pragma visibility.
 
 https://ssl.icu-project.org/trac/ticket/12023
 
 diff --git a/intl/icu/source/common/unicode/std_string.h b/intl/icu/source/common/unicode/std_string.h
 --- a/intl/icu/source/common/unicode/std_string.h
 +++ b/intl/icu/source/common/unicode/std_string.h
-@@ -22,16 +22,16 @@
+@@ -24,16 +24,16 @@
   * \brief C++ API: Central ICU header for including the C++ standard <string>
   *                 header and for related definitions.
   */
  
  #include "unicode/utypes.h"
  
  #if U_HAVE_STD_STRING
  
@@ -21,36 +21,36 @@ diff --git a/intl/icu/source/common/unic
  #include <string>
  
  #endif  // U_HAVE_STD_STRING
  
  #endif  // __STD_STRING_H__
 diff --git a/intl/icu/source/common/utypeinfo.h b/intl/icu/source/common/utypeinfo.h
 --- a/intl/icu/source/common/utypeinfo.h
 +++ b/intl/icu/source/common/utypeinfo.h
-@@ -17,14 +17,14 @@
+@@ -19,14 +19,14 @@
  // Whenever 'typeid' is used, this header has to be included
  // instead of <typeinfo>.
- // Visual Stuido 10 emits warning 4275 with this change. If you compile
+ // Visual Studio 10 emits warning 4275 with this change. If you compile
  // with exception disabled, you have to suppress warning 4275.
  #if defined(_MSC_VER) && _HAS_EXCEPTIONS == 0
  #include <exception>
  using std::exception;
  #endif
 -#if !defined(_MSC_VER)
 +#if defined(__GLIBCXX__)
  namespace std { class type_info; } // WORKAROUND: http://llvm.org/bugs/show_bug.cgi?id=13364
  #endif
  #include <typeinfo>  // for 'typeid' to work
  
  #endif
 diff --git a/intl/icu/source/io/unicode/ustream.h b/intl/icu/source/io/unicode/ustream.h
 --- a/intl/icu/source/io/unicode/ustream.h
 +++ b/intl/icu/source/io/unicode/ustream.h
-@@ -23,17 +23,17 @@
+@@ -25,17 +25,17 @@
   * \file
   * \brief C++ API: Unicode iostream like API
   *
   * At this time, this API is very limited. It contains
   * operator<< and operator>> for UnicodeString manipulation with the
   * C++ I/O stream API.
   */
  

deleted file mode 100644
--- a/intl/icu-patches/icu-release-56-1-flagparser-fix.patch
+++ /dev/null
@@ -1,14 +0,0 @@
-diff --git a/intl/icu/source/tools/pkgdata/pkgdata.cpp b/intl/icu/source/tools/pkgdata/pkgdata.cpp
---- a/intl/icu/source/tools/toolutil/flagparser.c
-+++ b/intl/icu/source/tools/toolutil/flagparser.c
-@@ -96,8 +96,8 @@
-     uprv_free(buffer);
- 
-     T_FileStream_close(f);
--    
--    if (U_FAILURE(*status)) {
-+
-+    if (U_FAILURE(*status) && *status != U_BUFFER_OVERFLOW_ERROR) {
-         return -1;
-     }
- 

new file mode 100644
--- /dev/null
+++ b/intl/icu-patches/ucol_getKeywordValuesForLocale-ulist_resetList.diff
@@ -0,0 +1,62 @@
+https://ssl.icu-project.org/trac/ticket/12827
+https://ssl.icu-project.org/trac/changeset/39484 (Excluding test-related bits
+because we remove the "test" directory before applying the ICU patches.)
+
+Index: /intl/icu/source/common/ulist.c
+===================================================================
+--- /intl/icu/source/common/ulist.c	(revision 39483)
++++ /intl/icu/source/common/ulist.c	(revision 39484)
+@@ -30,5 +30,4 @@
+     
+     int32_t size;
+-    int32_t currentIndex;
+ };
+ 
+@@ -52,5 +51,4 @@
+     newList->tail = NULL;
+     newList->size = 0;
+-    newList->currentIndex = -1;
+     
+     return newList;
+@@ -81,6 +79,7 @@
+         p->next->previous = p->previous;
+     }
+-    list->curr = NULL;
+-    list->currentIndex = 0;
++    if (p == list->curr) {
++        list->curr = p->next;
++    }
+     --list->size;
+     if (p->forceDelete) {
+@@ -151,5 +150,4 @@
+         list->head->previous = newItem;
+         list->head = newItem;
+-        list->currentIndex++;
+     }
+     
+@@ -194,5 +192,4 @@
+     curr = list->curr;
+     list->curr = curr->next;
+-    list->currentIndex++;
+     
+     return curr->data;
+@@ -210,5 +207,4 @@
+     if (list != NULL) {
+         list->curr = list->head;
+-        list->currentIndex = 0;
+     }
+ }
+@@ -273,3 +269,2 @@
+     return (UList *)(en->context);
+ }
+-
+Index: /intl/icu/source/i18n/ucol_res.cpp
+===================================================================
+--- /intl/icu/source/i18n/ucol_res.cpp	(revision 39483)
++++ /intl/icu/source/i18n/ucol_res.cpp	(revision 39484)
+@@ -681,4 +681,5 @@
+     }
+     memcpy(en, &defaultKeywordValues, sizeof(UEnumeration));
++    ulist_resetList(sink.values);  // Initialize the iterator.
+     en->context = sink.values;
+     sink.values = NULL;  // Avoid deletion in the sink destructor.

--- a/intl/update-icu.sh
+++ b/intl/update-icu.sh
@@ -1,35 +1,37 @@
 #!/bin/sh
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 set -e
 
 # Usage: update-icu.sh <URL of ICU SVN with release>
-# E.g., for ICU 55.1: update-icu.sh http://source.icu-project.org/repos/icu/icu/tags/release-55-1/
+# E.g., for ICU 58.1: update-icu.sh https://ssl.icu-project.org/repos/icu/icu/tags/release-58-1/
 
 if [ $# -lt 1 ]; then
   echo "Usage: update-icu.sh <URL of ICU SVN with release>"
   exit 1
 fi
 
 # Ensure that $Date$ in the checked-out svn files expands timezone-agnostically,
 # so that this script's behavior is consistent when run from any time zone.
 export TZ=UTC
 
+# Also ensure SVN-INFO isn't localized.
+export LANG=C
+
 icu_dir=`dirname $0`/icu
 
 # Remove intl/icu/source, then replace it with a clean export.
 rm -rf ${icu_dir}/source
 svn export $1/source/ ${icu_dir}/source
 
-# remove layout, tests, and samples, but leave makefiles in place
-find ${icu_dir}/source/layout -name '*Makefile.in' -prune -or -type f -print | xargs rm
+# remove layoutex, tests, and samples, but leave makefiles in place
 find ${icu_dir}/source/layoutex -name '*Makefile.in' -prune -or -type f -print | xargs rm
 find ${icu_dir}/source/test -name '*Makefile.in' -prune -or -type f -print | xargs rm
 find ${icu_dir}/source/samples -name '*Makefile.in' -prune -or -type f -print | xargs rm
 
 # remove data that we currently don't need
 rm -rf ${icu_dir}/source/data/brkitr/*
 rm ${icu_dir}/source/data/lang/*.mk
 rm ${icu_dir}/source/data/lang/*.txt
@@ -50,21 +52,20 @@ rm ${icu_dir}/source/data/unit/*.txt
 # (This ensures that if ICU modifications are performed properly, it's always
 # possible to run the command at the top of this script and make no changes to
 # the tree.)
 svn info $1 | grep -v '^Revision: [[:digit:]]\+$' > ${icu_dir}/SVN-INFO
 
 for patch in \
  bug-915735 \
  suppress-warnings.diff \
- bug-1172609-icu-fix.diff \
  bug-1172609-timezone-recreateDefault.diff \
  bug-1198952-workaround-make-3.82-bug.diff \
- icu-release-56-1-flagparser-fix.patch \
  bug-1228227-bug-1263325-libc++-gcc_hidden.diff \
+ ucol_getKeywordValuesForLocale-ulist_resetList.diff \
 ; do
   echo "Applying local patch $patch"
   patch -d ${icu_dir}/../../ -p1 --no-backup-if-mismatch < ${icu_dir}/../icu-patches/$patch
 done
 
 topsrcdir=`dirname $0`/../
 python ${topsrcdir}/js/src/tests/ecma_6/String/make-normalize-generateddata-input.py $topsrcdir