Add methods to add deoptimization data and use them from all the places
where we currently add them manually. Also add them to wasm-to-wasm
wrappers compiled on table set, which was missing before, leading to
the referenced bug.

Drive-by: Disable non-applicable MaybeHandle constructors to allow
overloading functions with different Handle types.

R=ahaas@chromium.org

Bug: chromium:779292
Change-Id: Ib9132d9faeb1092c46e22dd8196d201ce5c0942f
Reviewed-on: https://chromium-review.googlesource.com/774838Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49452}

This test iterates all builtin objects; explicitly deserialize builtins
when necessary to avoid verifying DeserializeLazy by accident.

Bug: v8:6624
Change-Id: Iab3f708380809b7486ef11a2816e9593ee7e65cd
Reviewed-on: https://chromium-review.googlesource.com/654902
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49451}

TBR=machenbach@chromium.org

Bug: chromium:748057
No-Try: true
Change-Id: I20a74823678510f343c865b074b2d088c1080b94
Reviewed-on: https://chromium-review.googlesource.com/776719
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49450}

- Warn on unused result for OS Allocate, Free, SetPermissions,
  CommitRegion, UncommitRegion functions.
- Adds CHECKS or DCHECK/USE around call sites.

Bug: chromium:756050

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: Ic00b0a42a1e09bdba013b7fa2b1b4e2b7591bac6
Reviewed-on: https://chromium-review.googlesource.com/769792Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49449}

R=machenbach@chromium.org

Bug: chromium:748057
Change-Id: I013bae778c3cc1ccf545d33bf99aadb42ad49834
Reviewed-on: https://chromium-review.googlesource.com/775122
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49448}

This reverts commit acfef3ec.

Reason for revert: Makes logmaps timeout in nosnap mode:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20nosnap/builds/18933

Original change's description:
> [log] Properly log all maps creating during bootstrapping
> 
> Logger::LogMaps will print all maps currently present on the heap.
> 
> Note that currently this does not properly log the detailed transitions
> for these maps.
> 
> Change-Id: Ia3218d371549d7634fe3eda9e8e59b0b0bd8bebb
> Reviewed-on: https://chromium-review.googlesource.com/753885
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Commit-Queue: Camillo Bruni <cbruni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#49444}

TBR=yangguo@chromium.org,cbruni@chromium.org

Change-Id: I264362552cbc2f8f0c1df84412f4dbeea08ef384
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/776815Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49447}

Bug: 
Change-Id: Ide7fab96e5ba1650aa17ba266e6ed2ed893208d7
Reviewed-on: https://chromium-review.googlesource.com/776658Reviewed-by: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49446}

Since we only ever have preparsed scope info data for functions that
haven't been parsed yet, it never overlaps with there being other
function data (such as a bytecode array). So, we can merge the two
fields.

This drops the SharedFunctionInfo size by one pointer.

Bug: chromium:783853
Change-Id: I7166010271cf661b04d3d118ac87c65c79555f96
Reviewed-on: https://chromium-review.googlesource.com/774863Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49445}

Logger::LogMaps will print all maps currently present on the heap.

Note that currently this does not properly log the detailed transitions
for these maps.

Change-Id: Ia3218d371549d7634fe3eda9e8e59b0b0bd8bebb
Reviewed-on: https://chromium-review.googlesource.com/753885Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49444}

This test uses 136GB of memory which is too much for our MIPS boards.

NOTRY=true

Bug: v8:7093
Change-Id: I382bf0832da6ae74241e89a2016c3738f03979fd
Reviewed-on: https://chromium-review.googlesource.com/776765Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49443}

This removes support for optimized frame which lack deoptimization
information. All optimized JavaScript frames now imply that the
underlying bytecode is available too.

R=rmcilroy@chromium.org
BUG=v8:6409

Change-Id: Ie73c0a376002466884388f1da9e1ec2741884596
Reviewed-on: https://chromium-review.googlesource.com/612162
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49442}

This reverts commit 3e0bf580.

Reason for revert: MSVC does not compile any more, see https://build.chromium.org/p/client.v8/builders/V8%20Win64%20-%20msvc/builds/172

Original change's description:
> MIPS[64] Implementation of MSA instructions in builtin simulator
> 
> This commit is a step toward enabling test-run-wasm-simd tests for MIPS.
> 36 of those were failing in V8 builtin simulator because some instructions
> were not implemented.  Also there are minor fixes to some of the already
> implemented instructions.
> 
> This commit has only 32-bit implementation. After review I will add
> 64-bit version.
> 
> Bug: 
> Change-Id: I25b0cac352db3efb56b922ace64ab2aaef82472d
> Reviewed-on: https://chromium-review.googlesource.com/744008
> Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
> Cr-Commit-Position: refs/heads/master@{#49439}

TBR=jkummerow@chromium.org,mstarzinger@chromium.org,mlippautz@chromium.org,bmeurer@chromium.org,predrag.rudic@mips.com,ivica.bogosavljevic@mips.com,Ilija.Pavlovic@mips.com,sreten.kovacevic@mips.com,Miran.Karic@imgtec.com

Change-Id: Ic0c6339473481fa75908e942bc86de2b5c6349d8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/776655Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49441}

std::is_base_of<A, B> has undefined behaviour if B is not a complete
type. Hence, avoid it and use is_convertible<B*, A*> instead.
This captures exactly the requirement that
  Handle<A> foo() { return produce<Handle<B>>(); }
is valid exactly if
  A* foo() { return produce<B>(); }
is valid.
Also, change some static asserts to enable_ifs in order to allow
overloading a function by different Handle types, which would cause
disambiguity otherwise.

R=tebbi@chromium.org

Change-Id: I60fbdfcfd96c7b216e42819a5b5de3423a2c38d0
Reviewed-on: https://chromium-review.googlesource.com/774841Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49440}

This commit is a step toward enabling test-run-wasm-simd tests for MIPS.
36 of those were failing in V8 builtin simulator because some instructions
were not implemented.  Also there are minor fixes to some of the already
implemented instructions.

This commit has only 32-bit implementation. After review I will add
64-bit version.

Bug: 
Change-Id: I25b0cac352db3efb56b922ace64ab2aaef82472d
Reviewed-on: https://chromium-review.googlesource.com/744008Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
Cr-Commit-Position: refs/heads/master@{#49439}

Added return value registers on both MIPS32 and MIPS 64.

Bug: 
Change-Id: I3199a73f90ef7b0bc9e18d716fcdf4c8c479f7fd
Reviewed-on: https://chromium-review.googlesource.com/774286Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
Cr-Commit-Position: refs/heads/master@{#49438}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/98bbbff..5698e23

Rolling v8/buildtools: https://chromium.googlesource.com/chromium/buildtools/+log/93a751e..3196d83

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/755a485..fd88dfb

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/4b58512..e70074d

R=machenbach@chromium.org

Change-Id: If3f0ca871fbcf5e46876d2dab00b034dc496f91c
Bug: 
Reviewed-on: https://chromium-review.googlesource.com/775632Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49437}

This reverts commit 01f670d8.

Reason for revert: https://crbug.com/785170

Original change's description:
> Update V8 DEPS.
> 
> Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/98bbbff..610a818
> 
> Rolling v8/buildtools: https://chromium.googlesource.com/chromium/buildtools/+log/93a751e..9c40f80
> 
> Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/755a485..1087227
> 
> Rolling v8/third_party/instrumented_libraries: https://chromium.googlesource.com/chromium/src/third_party/instrumented_libraries/+log/e07d437..7f70365
> 
> Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/4b58512..c2f2e01
> 
> TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org
> 
> Change-Id: Ic9902f605333991c0d33f91f22dca32763a7f21d
> Reviewed-on: https://chromium-review.googlesource.com/775835
> Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
> Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#49435}

TBR=v8-autoroll@chromium.org,machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org

Change-Id: I9c0a5c9130a59dbdc45648062c1ed7d470ee7b13
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/776593Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49436}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/98bbbff..610a818

Rolling v8/buildtools: https://chromium.googlesource.com/chromium/buildtools/+log/93a751e..9c40f80

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/755a485..1087227

Rolling v8/third_party/instrumented_libraries: https://chromium.googlesource.com/chromium/src/third_party/instrumented_libraries/+log/e07d437..7f70365

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/4b58512..c2f2e01

TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org

Change-Id: Ic9902f605333991c0d33f91f22dca32763a7f21d
Reviewed-on: https://chromium-review.googlesource.com/775835Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49435}

It was shipped in Chrome 62.

Bug: v8:5070
Cq-Include-Trybots: master.tryserver.v8:v8_linux_noi18n_rel_ng
Change-Id: I77119540411d1fe15691d40012cb96f4e2e45048
Reviewed-on: https://chromium-review.googlesource.com/776154Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49434}

"AbsoluteDivSmall" had a shortcut path for abs(divisor) == 1 where
it would simply return the dividend as result. However, its caller
"Divide" was blissfully ignorant of this trick and would therefore
simply set the value's sign as needed, modifying the input.
This CL prevents that, while continuing to avoid the full division
algorithm for abs(divisor) == 1.

Bug: v8:6791
Change-Id: I04cdc93f5ed2a696587c35c754e68f07012dd1a9
Reviewed-on: https://chromium-review.googlesource.com/772332
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49433}

This reverts commit b8092f43.

Reason for revert: Seems to crash all tests on arm debug:
https://chromium-swarm.appspot.com/task?id=39df3b647e100a10&refresh=10&show_raw=1

Original change's description:
> Remove no_custom_libcxx and update V8 DEPS.
> 
> Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/98bbbff..5698e23
> 
> Rolling v8/buildtools: https://chromium.googlesource.com/chromium/buildtools/+log/93a751e..9c40f80
> 
> Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/755a485..fd88dfb
> 
> Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/4b58512..e70074d
> 
> R=​machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org
> 
> Change-Id: I659fc77cdada9b96c42b9b7ea86766b47b6f8352
> Reviewed-on: https://chromium-review.googlesource.com/775320
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#49428}

TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org,thomasanderson@chromium.org

Change-Id: I9a6210bfdea9ad0d0a344a97bf0ce63d13e90288
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/775159Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49432}

BUG=v8:7068
R=kschimpf@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: Iaf29d3696094722853fb67b29c697860752e256e
Reviewed-on: https://chromium-review.googlesource.com/763995
Commit-Queue: Eric Holk <eholk@chromium.org>
Reviewed-by: Eric Holk <eholk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49431}

- Adds SetPermissions method which returns bool result.
- Eliminates Guard, SetReadAndWritable, SetReadAndExecutable, and
  SetReadWriteAndExecutable methods.
- Adds some Fuchsia memory allocation implementation.
- Some minor fixes in usage of OS::AllocatePageSize and
  OS::CommitPageSize.
- Adds DCHECKs for sanitizing parameters to OS::Allocate/Free.

Bug: chromium:756050
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I966ec6f029dd0371d70eca20bae197d87956f8b5
Reviewed-on: https://chromium-review.googlesource.com/760657
Commit-Queue: Bill Budge <bbudge@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49430}

Reland of https://chromium-review.googlesource.com/c/v8/v8/+/727893
The crashes should be fixed by https://chromium-review.googlesource.com/c/v8/v8/+/763531

Original change's description:
> Revert "Reland^5 "[turbofan] eagerly prune None types and deadness from the graph""
> 
> This reverts commit ac0661b3.
> 
> Reason for revert: Clusterfuzz unhappy: chromium:783019 chromium:783035
> 
> Original change's description:
> > Reland^5 "[turbofan] eagerly prune None types and deadness from the graph"
> >
> > This gives up on earlier attempts to interpret DeadValue as a signal of
> > unreachable code. This does not work because free-floating dead value
> > nodes, and even pure branch nodes that use them, can get scheduled so
> > early that they get reachable. Instead, we now eagerly remove branches
> > that use DeadValue in DeadCodeElimination and replace DeadValue inputs
> > to value phi nodes with dummy values.
> >
> > Reland of https://chromium-review.googlesource.com/715716
> >
> > Bug: chromium:741225 chromium:776256
> > Change-Id: I251efd507c967d4a8882ad8fd2fd96c4185781fe
> > Reviewed-on: https://chromium-review.googlesource.com/727893
> > Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> > Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#49188}
> 
> TBR=jarin@chromium.org,tebbi@chromium.org
> 
> Bug: chromium:741225 chromium:776256 chromium:783019 chromium:783035
> Change-Id: I6a8fa3a08ce2824a858ae01817688e63ed1f442e
> Reviewed-on: https://chromium-review.googlesource.com/758770
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#49262}

TBR=jarin@chromium.org,tebbi@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:741225 chromium:776256 chromium:783019 chromium:783035
Change-Id: I6c02b4beb02997ec34015ed2f6791a93c70f5e36
Reviewed-on: https://chromium-review.googlesource.com/772150
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49429}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/98bbbff..5698e23

Rolling v8/buildtools: https://chromium.googlesource.com/chromium/buildtools/+log/93a751e..9c40f80

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/755a485..fd88dfb

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/4b58512..e70074d

R=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org

Change-Id: I659fc77cdada9b96c42b9b7ea86766b47b6f8352
Reviewed-on: https://chromium-review.googlesource.com/775320Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49428}

Bug: 
Change-Id: Ibd7c17b4ace25237c3d35466280aff27c44016f0
Reviewed-on: https://chromium-review.googlesource.com/774461Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49427}

This is a reland of 77b0baa6.

Original change's description:
> [wasm] Fix importing wasm-lazy-compile stubs
>
> If two modules use lazy compilation, and one imports a function of
> another, we are unwrapping the js-to-wasm wrapper of the export. This
> was failing so far, because during unwrapping we did not find the wasm
> code.
> This CL fixes this by also recognizing WasmCompileLazy stubs as "wasm
> code".
>
> R=ahaas@chromium.org
>
> Bug: chromium:779569, v8:5991
> Change-Id: If2260c3721e3746a7635b9d0182fd520df2fb773
> Reviewed-on: https://chromium-review.googlesource.com/771672
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Reviewed-by: Andreas Haas <ahaas@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#49405}

Bug: chromium:779569, v8:5991
Change-Id: I4818e933467bd5a040f1514b8fc18db219a092c7
Reviewed-on: https://chromium-review.googlesource.com/774538Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49426}

We extended the platform API so that it is now possible to post
foreground tasks from background tasks. This new platform API has been
implemented now in all platforms within V8, and in the gin platform in
chrome. The implementation in node.js is still missing. I don't think
there are any node.js tests which use async compilation for
WebAssembly. Therefore we could turn on async compilation again to get
canary coverage.

Bug:chromium:764313

R=titzer@chromium.org, bradnelson@chromium.org
CC=franzih@chromium.org

Change-Id: Ib7f17d84983ad73b936e1de691c18c2f7e06ca5e
Reviewed-on: https://chromium-review.googlesource.com/775338
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Brad Nelson <bradnelson@chromium.org>
Reviewed-by: Brad Nelson <bradnelson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49425}

At the moment the inspector tests do not dispose the isolate. This is a
problem because the disposal of the isolate is used to stop the
execution of background tasks. The missing disposal of the isolate
caused flaky tests on the bots recently. With this CL the isolates of
the inspector tests get disposed.

The disposal of the isolate requires the following changes: 1) Store the
isolate in a unique_ptr so that it gets disposed when the isolate-data
gets disposed. It is necessary to use the unique_ptr so that the isolate
gets disposed after other members of isolate-data get disposed.  2)
Dispose all sessions. The reason is that the sessions require the
isolate to exist when they get disposed because they own handles.
Sessions, however, are stored in a static map, whereas the isolate is
stored indirectly in a local variable of the main function. Since local
variables get disposed before the static map is cleared, we have to
clear the map before the end of the main function.

R=kozyatinskiy@chromium.org

Change-Id: Icb33184de254638b6cdfb899e940f18e6064cd69
Reviewed-on: https://chromium-review.googlesource.com/774885Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49424}

When initializing the stack state at a merge point, don't force all
stack slots into registers. Allow constants to stay constants as long
as they are not part of the merge. Otherwise we might break assumptions
of outer blocks which then try to merge a register into a constant and
fail.
Also, add some documentation to {InitMergeStackSlot} to document the
intent of the implementation.

R=titzer@chromium.org

Bug: v8:784050, v8:6600
Change-Id: I3a4c83b446909027be075d3207cb7c748a6b1aad
Reviewed-on: https://chromium-review.googlesource.com/766353Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49423}

Now that UnoptimizedCompileJob only has three stages, move the logic for
stepping between these stages out of UnoptimizedCompileJob and back into
CompilerDispatcher.

BUG=v8:5203

Change-Id: I3bb776e14ef9da801dc9792e9e643b8026135060
Reviewed-on: https://chromium-review.googlesource.com/774743Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49422}

Make the accessors of SharedFunctionInfo instance_class_name take and
return String rather than Object, since it's always a String anyway.

Change-Id: Ic5dacccf3835550e3533356fe7ded37ea107d720
Reviewed-on: https://chromium-review.googlesource.com/774882Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49421}

Align the stack operations in the deoptimizer and take the opportunity to
factorise and improve the code generated for copying.

Bug: v8:6644
Change-Id: I854a975c371936bbf720d56e80dc0c9d68fe7c92
Reviewed-on: https://chromium-review.googlesource.com/763535Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Martyn Capewell <martyn.capewell@arm.com>
Cr-Commit-Position: refs/heads/master@{#49420}

With this CL both the AsyncCompileJob and the ModuleCompiler use the new
TaskRunner API to post tasks. With the TaskRunner API it is also valid
to post foreground tasks from background tasks.

R=titzer@chromium.org

Change-Id: Ie3a1b0026f834c25540407eb79abdf67071915fb
Reviewed-on: https://chromium-review.googlesource.com/741590Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49419}

CompileTasks contain a pointer to the isolate. All tasks which have a
pointer to the isolate have to be cancelable to make sure that the task
does not execute after the isolate shut down.

R=rmcilroy@chromium.org

Change-Id: I10b2af0177b5cb60ab1dfdad47529fb8c7301ba0
Reviewed-on: https://chromium-review.googlesource.com/774441Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49418}

Bug: v8:6917
Change-Id: Ic50ed8aca2ef6b6e60eae194cf46c2264a416657
Reviewed-on: https://chromium-review.googlesource.com/774265
Commit-Queue: Michał Majewski <majeski@google.com>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49417}

Blink wants to use Maybe<T> as a return type of (author) callback
functions, where T can be type void.  So, this patch adds support
of Maybe<void>.

Bug: chromium:778580, chromium:779036
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: Id654bafc5ceac8ef6f755902418f250c353a8837
Reviewed-on: https://chromium-review.googlesource.com/771730
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49416}

Bug: v8:6917
Cq-Include-Trybots: master.tryserver.v8:v8_linux_noi18n_rel_ng
Change-Id: I09fb05ac6d4b9b1223118494ce2c89e3ab5de109
Reviewed-on: https://chromium-review.googlesource.com/771870Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michał Majewski <majeski@google.com>
Cr-Commit-Position: refs/heads/master@{#49415}

This ensures that the {Code::builtin_index} field is only set during
allocation of new {Code} objects, making this field truly immutable.

R=jgruber@chromium.org
BUG=v8:6792

Change-Id: Ic793346976183149e2d077e92cb9da3c925ea865
Reviewed-on: https://chromium-review.googlesource.com/774439Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49414}

Simplifies the unoptimized compile job to have only three steps, the
on-main-thread prepare step, the off-thread compile step and the
on-main-thread finalization step.

As part of this change, the compiler dispatcher no longer supports
functions with outer scopeinfo's, since these need to be analysed on the
main thread.

BUG=v8:5203

Change-Id: Ifb378ef81bd47b6f6d4037a3b8acf88660896c4e
Reviewed-on: https://chromium-review.googlesource.com/774558
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49413}