--- a/js/src/jit/MIR.h
+++ b/js/src/jit/MIR.h
@@ -7556,20 +7556,17 @@ class MRegExpMatcher
     }
     MDefinition* sticky() const {
         return getOperand(3);
     }
 
     bool writeRecoverData(CompactBufferWriter& writer) const override;
 
     bool canRecoverOnBailout() const override {
-        // XXX: always return false for now, to work around bug 1132128.
-        if (false && regexp()->isRegExp())
-            return !regexp()->toRegExp()->source()->needUpdateLastIndex();
-        return false;
+        return true;
     }
 
     bool possiblyCalls() const override {
         return true;
     }
 };
 
 class MRegExpTester
@@ -7616,23 +7613,17 @@ class MRegExpTester
     }
 
     bool possiblyCalls() const override {
         return true;
     }
 
     bool writeRecoverData(CompactBufferWriter& writer) const override;
     bool canRecoverOnBailout() const override {
-        // RegExpTester has a side-effect on the regexp object's lastIndex
-        // when sticky or global flags are set.
-        // Return false unless we are sure it's not the case.
-        // XXX: always return false for now, to work around bug 1132128.
-        if (false && regexp()->isRegExp())
-            return !regexp()->toRegExp()->source()->needUpdateLastIndex();
-        return false;
+        return true;
     }
 };
 
 template <class Policy1>
 class MStrReplace
   : public MTernaryInstruction,
     public Mix3Policy<StringPolicy<0>, Policy1, StringPolicy<2> >::Data
 {

--- a/js/src/vm/RegExpObject.h
+++ b/js/src/vm/RegExpObject.h
@@ -423,20 +423,16 @@ class RegExpObject : public NativeObject
         flags |= global() ? GlobalFlag : 0;
         flags |= ignoreCase() ? IgnoreCaseFlag : 0;
         flags |= multiline() ? MultilineFlag : 0;
         flags |= sticky() ? StickyFlag : 0;
         flags |= unicode() ? UnicodeFlag : 0;
         return RegExpFlag(flags);
     }
 
-    bool needUpdateLastIndex() const {
-        return sticky() || global();
-    }
-
     /* Flags. */
 
     void setIgnoreCase(bool enabled) {
         setSlot(IGNORE_CASE_FLAG_SLOT, BooleanValue(enabled));
     }
 
     void setGlobal(bool enabled) {
         setSlot(GLOBAL_FLAG_SLOT, BooleanValue(enabled));