Merge m-c to inbound, a=merge CLOSED TREE

Backed out changeset df12438d4091 (bug 1189581) for wpt failures CLOSED TREE

Backed out changeset a9a241b0c121 (bug 1207827) for Windows SM bustage CLOSED TREE

Bug 1213721 - Tracking bug for migration from ftp.m.o to S3, r=rail

Bug 1189581 - Make service-workers/service-worker/fetch-cors-xhr.https.html pass; r=bkelly

Bug 1213567: Prevent neutering from occurring during CreateWindow(Ex) calls; r=jimm

Bug 1207827 - Delete Assembler::actualOffset() and transitive closure. r=nbp The implemetation of Assembler::actualOffset() is now a no-op in all targets, and it is no longer necessary to rewrite assembler buffer offsets to their final form after finishing the assembler buffer. - Delete Assembler::actualOffset() in all targets. - Delete AsmJSModule::CodeRange::updateOffsets(). - Delete AsmJSModule::updateCodeOffset(). - Delete AsmJSModule::updateOffsets(). - Delete CodeOffsetLabel::fixup(). - Delete ICEnty::fixupReturnOffset(). - Delete LSafepoint::fixupOffset(). - Delete OsiIndex::fixUpOffset(). - Delete PCMappingEntry::fixupNativeOffset(). Also delete all code calling these functions.

Bug 1207827 - Remove ARM temporary offset buffers. r=nbp The ARM assembler no longer needs to keep track of code offsets for later translation to 'actual' offsets. The AssemblerBuffer offsets are directly usable now. Remove tmpDataRelocations_, tmpPreBarriers_, and tmpJumpRelocations_.

Bug 1207827 - Remove ARM64 temporary offset buffers. r=nbp The ARM64 assembler no longer needs to keep track of code offsets for later translation to 'final' offsets. The AssemblerBuffer offsets are directly usable now. Remove tmpDataRelocations_, tmpPreBarriers_, tmpJumpRelocations_, and the finalOffset() method.

Bug 1207827 - Eliminate poolSizeBefore(). r=nbp This method was used by the Assembler::actualOffset() methods to translate buffer offsets from pre-pool to post-pool numbers. Since pools are now injected immediately, there is no need to translate offsets. All the actualOffset() methods have become no-ops in all our supported targets.

Bug 1207827 - Switch jit::Pool to a LifoAllocPolicy. r=nbp This is possible because we no longer PodCopy the pools. Use a more reasonable size for the inline memory in the loadOffsets vector (8 loads instead of 512). This saves stack space when a MacroAssembler is created on the stack. Use a matching inline size of 8 entries for the poolData array itself. Don't drop memory in Pool::reset() by calling placement new - call Vector::clear() instead which hangs on to previously allocated memory for use by the next pool. Delete an unused array of pools in arm64/vixl/MozBaseAssembler-vixl.h.

Bug 1207827 - Use a Vector for poolInfo_. r=nbp Use a Vector with 8 preallocated slots and a LifoAllocPolicy allocating from the parent AssemblerBuffer's lifoAlloc_. We'll rarely need more than 8 constant pools in a single assembler. We can't actually allocate memory from this->lifoAlloc_ in the constructor, but it is OK to capture allocator references like the Vector constructor does. Add an assertion to initWithAllocator() to verify that we didn't allocate anything from lifoAlloc_ before the MacroAssembler constructor had a chance to install an AutoJitContextAlloc.

Bug 1207827 - Stop perforating AssemblerBuffers. r=nbp There is no longer a 1-1 correspondence between buffer slices and constant pools. We no longer need the ability to truncate a buffer slice prematurely. This uses less memory.

Bug 1207827 - Copy pool data into buffer immediately. r=nbp Since constant pools have been simplified such that they always follow the load instructions referencing them, it is now possible to copy the pool data into the main assembly buffer right away in finishPool() instead of deferring the copy to executableCopy(). This has the important effect that BufferOffset values don't need to be adjusted to account for the size of injected constant pools. - In finishPool(), copy the constant pool data into the main assembler buffer with putBytesLarge() which allows the potentially large pool data to be split over multiple slices. - Stop copying pool data in executableCopy(). It has already been copied in finishPool(). - Simplify the PoolInfo data structure to a simple (firstEntry, offset) pair which records the necessary information about a single emitted constant pool. - Rewrite poolEntryOffset() to use the new PoolInfo data. - Simplify poolSizeBefore() to just return 0. This function will be removed entirely in a followup patch. - Stop patching branches in executableCopy() and delete the patchBranch() method. Since buffer offsets are reliable when the branches are inserted and when labels are bound, there is no need to adjust branches to account for constant pools. - Delete the BufferSliceTail class. It is no longer necessary to maintain a bit vector of branch instructions since we don't rewrite branches any longer. Use the plain AssemblerBuffer::Slice class instead. This patch implements the basic functional change of copying pool data immediately instead of deferring it. Followup patches will clean up the now redundant code.

Bug 1207827 - Fix ARM64 OOM bugs in Assembler::bind(). r=nbp

Bug 1207827 - Fix OOM error in ARM64 simulator. r=nbp

Bug 1207827 - Add AssemblerBuffer::putBytesLarge. r=nbp This new method copies a large amount of data into the assembler buffer, potentially splitting it across multiple slices. The existing putBytes() method can only copy into a single slice which limits the maximum since of data that can be inserted and potentially wastes space at the end of the previous slice.

Bug 1215814 - Small ThrowIfNotConstructing cleanup. r=efaust

Bug 918771 - Part 3: Update Web Platform tests to check for correct behavior, r=bz

Bug 918771 - Part 2: Send text/html as MIME type for XHR send() of HTML document, r=bz