This is a reland of fcf28e83

Original change's description:
> [diagnostics] Enable logging for --perf-prof and --ll-prof.
>
> Change-Id: I09722d0ce372a825dfe454583da433b38cf4de60
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2647109
> Reviewed-by: Camillo Bruni <cbruni@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Commit-Queue: Pierre Langlois <pierre.langlois@arm.com>
> Cr-Commit-Position: refs/heads/master@{#72311}

Change-Id: Ib304c42eb16000a67ecb0264e7714339e7a2bbd1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2649037Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Pierre Langlois <pierre.langlois@arm.com>
Cr-Commit-Position: refs/heads/master@{#72320}

When cross-compiling builtins, hardcode the fact that targeting MACOSX
enables JSCVT. This is useful when cross-compiling from a x86 Mac where
the compiler itself does not define __ARM_FEATURE_JSCVT for the
mksnapshot binary.

Change-Id: I2817f18de42b18f6236e5d5f26d574a0955a7557
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2637228
Commit-Queue: Pierre Langlois <pierre.langlois@arm.com>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72319}

This reserves space in a newly several newly created vectors before
pushing a known number of elements.

Change-Id: If3ba016395e7b509ced549b57279a049125c5d7c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2649034Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72318}

On most platforms, we can do a single allocation for all code. On
platforms where this is not possible (e.g. ARM64 has a 128MB code space
limit), we will at least allocate big chunks instead of one chunk per
function. This reduces overhead in {WasmCodeAllocator} for maintaining
sets of used and available code space, and reduces locking during
deserialization.

In order to know how much code space to pre-allocate, the serializer
writes out the total code space size. This is then used during
deserialization to know how much code to expect.

R=thibaudm@chromium.org

Bug: v8:11164
Change-Id: If3846292544c7b6832b7a0b56357b74310f6fb23
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2644942
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72317}

This reverts commit fcf28e83.

Reason for revert: Speculative revert since all gpu bots are failing:
https://ci.chromium.org/p/v8/builders/ci/Linux%20V8%20FYI%20Release%20(NVIDIA)/13141

Original change's description:
> [diagnostics] Enable logging for --perf-prof and --ll-prof.
>
> Change-Id: I09722d0ce372a825dfe454583da433b38cf4de60
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2647109
> Reviewed-by: Camillo Bruni <cbruni@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Commit-Queue: Pierre Langlois <pierre.langlois@arm.com>
> Cr-Commit-Position: refs/heads/master@{#72311}

TBR=cbruni@chromium.org,jgruber@chromium.org,pierre.langlois@arm.com

Change-Id: I4f0fd218b707fd8eef9e1a5319d30012e76c88fd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2649036Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72316}

Details: https://docs.google.com/document/d/1-Gi37Ks7rXMVVRkC_HkwGxenP7T1huQUOMrYOtkUCFk/edit?usp=sharing

Bug: v8:11340
Change-Id: Ia1d75270373a7ef2307e7ee0fd24da9ecfa27d18
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2643381Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72315}

Change-Id: I702f8c021490f0538a98cad9a61b1dbae60fb881
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2649027Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72314}

.. which applied to the AssemblePopArgumentsAdaptorFrame
function that no longer exists.

Drive-by: Remove unused functions in mips, mips64.

Bug: v8:11306
Change-Id: Ia47c4287a452afe0aea2be0902cb3adce15f02bf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2649029Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72313}

The same bit field (MiscField) is currently used to encode either a SIMD
lane size or a memory access mode depending on the instruction.

For now this does not conflict, but in order to support protected loads
and stores on arm64, we will need to add a protected access mode to some
SIMD instructions that already encode a lane size (kArm64LoadSplat,
kArm64LoadLane, kArm64StoreLane).

To prepare for this, use non-overlapping bits of the Misc field to
encode the two properties.

R=zhin@chromium.org
CC=ahaas@chromium.org

Bug: v8:11098
Change-Id: I2320b2be74d023429f8b8c78a5736b13f53c0399
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2643390
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72312}

Change-Id: I09722d0ce372a825dfe454583da433b38cf4de60
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2647109Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Pierre Langlois <pierre.langlois@arm.com>
Cr-Commit-Position: refs/heads/master@{#72311}

This reverts commit ec7e9a8d.

Reason for revert: failure was due to a clang bug that is fixed in
latest rolled clang.

Original change's description:
> [test] Disable cctest/test-loop-analysis/LaEdgeMatrix2_0 on ODROID
>
> Bug: chromium:1163847
> Change-Id: Iabb152cd1a5c04e2032cb1254d8b27ea081cbb27
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2614427
> Auto-Submit: Leszek Swirski <leszeks@chromium.org>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#71952}

TBR=machenbach@chromium.org,leszeks@chromium.org

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

Bug: chromium:1163847
Change-Id: Iba18918e8ceab166e7d5e9751e857f13142ed583
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2647153Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72310}

Port 22e06c7b

Original Commit Message:

    Factor out the code sequence into macro-assembler functions to be reused
    by Liftoff.

R=zhin@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: I94d4c8ec8a374a030918c7781b5d4a40dc29091b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2648985Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72309}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/710b42c..32fd3b2

Rolling v8/buildtools: https://chromium.googlesource.com/chromium/src/buildtools/+log/13547b9..450b6b6

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/07bd252..1076f38

Rolling v8/tools/swarming_client: https://chromium.googlesource.com/infra/luci/client-py/+log/1a07271..a32a160

TBR=machenbach@chromium.org,tmrts@chromium.org,v8-waterfall-sheriff@grotations.appspotmail.com

Change-Id: Iaf9a49e55a724d28bf41f9fb0d510105462af385
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2649237Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#72308}

This change completes support for import assertions for dynamic import().

A new version of the HostImportModuleDynamically callback taking import
assertions is added to the public API. The name is very verbose; we
could consider removing the "ImportAssertions" part when the old API
is removed.

Bytecode generation is updated to pass the assertions, if present, to
Runtime_DynamicImportCall.

Isolate::RunHostImportModuleDynamicallyCallback extracts the assertions
from the options bag, filters out the assertions not present in the
list specified by the host in HostGetSupportedImportAssertions, and
sorts them by code point order of the keys per
https://tc39.es/proposal-import-assertions/#sec-import-call-runtime-semantics-evaluation.
The resulting array is passed to the host in the callback.

Bug: v8:10958
Change-Id: I931df00f954a9f9c65bff5bcf461ba1c8f11e94e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2620578
Commit-Queue: Dan Clark <daniec@microsoft.com>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72307}

This CL implements the upcoming spec change:
https://github.com/tc39/proposal-regexp-match-indices/pull/49

A new JSRegExpResultWithIndices subclass is introduced with a separate map and
an extra slot for storing the indices. If /d is passed, exec() constructs a
JSRegExpResultWithIndices and eagerly builds indices.

The existing re-execution logic is removed.

Bug: v8:9548
Change-Id: Ic11853e7521017af5e8bd583c7b82bb672821132
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2616873
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72306}

This reverts commit 9c09c227.

Reason for revert: gc stress failures https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux%20-%20arm64%20-%20sim%20-%20gc%20stress/20563/overview

Original change's description:
> [wasm-simd] Merge all any_true to v128.any_true
>
> In https://github.com/WebAssembly/simd/pull/423, all any_true
> instructions were removed, and replaced with a single v128.any_true.
>
> This patch removes all but v8x16.any_true, and renames it to
> v128.any_true.
>
> Bug: v8:11331
> Change-Id: Ie394ec841a1a1c4030c4f589eac2cee8a6a2a1f9
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2639033
> Reviewed-by: Georg Neis <neis@chromium.org>
> Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
> Commit-Queue: Zhi An Ng <zhin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#72304}

TBR=neis@chromium.org,gdeepti@chromium.org,neis@google.com,zhin@chromium.org

Change-Id: I52dbf8de679059dd7b17908c1fe3ada0eb54ff84
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:11331
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2649240Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72305}

In https://github.com/WebAssembly/simd/pull/423, all any_true
instructions were removed, and replaced with a single v128.any_true.

This patch removes all but v8x16.any_true, and renames it to
v128.any_true.

Bug: v8:11331
Change-Id: Ie394ec841a1a1c4030c4f589eac2cee8a6a2a1f9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2639033Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72304}

Implement https://github.com/tc39/ecma402/pull/500

For the legacy [optional]  Unwrap*Format steps, use OrdinaryHasInstance
instead of InstanceofOperator.

ECMA402 agree w/ PR500 on 2021-1-14

Bug: v8:10981
Change-Id: Ic697aa245b11fecaf998127c009e59a821aaa01e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2444092Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72303}

This reverts commit 5a0938e5.

Reason for revert: Broke build https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket.appspot.com/8857098178780038608/+/steps/Check/0/logs/RunWasm_I32x4WidenI8x16S_liftoff/0

Original change's description:
> [wasm-simd][x64] Prototype i32x4.widen_i8x16_{s,u}
>
> This prototypes i32x4.widen_i8x16_s and i32x4.widen_i8x16_u for x64. It
> uses some masks and pshufb for the widening.  These masks (3 for each
> instruction) are stored as external references.
>
> Bug: v8:11297
> Change-Id: I6c8f55426bbb44b16ed552f393762c34c2524b55
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2617389
> Commit-Queue: Zhi An Ng <zhin@chromium.org>
> Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
> Reviewed-by: Georg Neis <neis@chromium.org>
> Reviewed-by: Andreas Haas <ahaas@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#72301}

TBR=neis@chromium.org,gdeepti@chromium.org,neis@google.com,ahaas@chromium.org,zhin@chromium.org

Change-Id: I83aa2e86854e39ac6afd250fdc0dfac7cdd99e6d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:11297
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2648194Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72302}

This prototypes i32x4.widen_i8x16_s and i32x4.widen_i8x16_u for x64. It
uses some masks and pshufb for the widening.  These masks (3 for each
instruction) are stored as external references.

Bug: v8:11297
Change-Id: I6c8f55426bbb44b16ed552f393762c34c2524b55
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2617389
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72301}

Factor out the code sequence into macro-assembler functions to be reused
by Liftoff.

Bug: v8:10975
Change-Id: I82e253c94e09bf62197e7de87359d0e3956d2dcc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2643662
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72300}

The change https://chromium-review.googlesource.com/c/v8/v8/+/2572173
implemented HostGetSupportedImportAssertions [1] in a fairly literal
sense, where the host supplies a list of supported import assertions
and V8 filters the import assertions in a ModuleRequest and exposes
only supported assertions via its API surface.

However, we've decided that the interop guarantees provided
by doing the filtering in V8 are probably not worth the added
complexity. Thus, this change removes the filtering. Going forward,
hosts will be expected to ignore unknown asserions received from V8.

This is mostly a revert of
https://chromium-review.googlesource.com/c/v8/v8/+/2572173, with
v8::Isolate::CreateParams::supported_import_assertions being kept
for now (since we first have to delete the Blink code that sets it),
and a new comment in v8.h instructing hosts to ignore unknown
assertions.

[1] https://tc39.es/proposal-import-assertions/#sec-hostgetsupportedimportassertions

Bug: v8:10958
Change-Id: I7e8e2a7fbfe2d5bf891805cff6c3160d0e6825cd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2643563Reviewed-by: Marja Hölttä <marja@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Dan Clark <daniec@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#72299}

If a lazy compilation happens in between 2 Wasm calls, we need to save
the full Q register, since we can have live v128 values.

Bug: chromium:1161555
Change-Id: I7393d6fbf5133f635a8fd62cd394323d7018f090
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2645694Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72298}

Prototype these 6 instructions on x64:

- f64x2.convert_low_i32x4_s
- f64x2.convert_low_i32x4_u
- i32x4.trunc_sat_f64x2_s_zero
- i32x4.trunc_sat_f64x2_u_zero
- f32x4.demote_f64x2_zero
- f64x2.promote_low_f32x4

Some of these code sequences make use of special masks, we keep them in
external references.

Code sequence based on suggestions at:
https://github.com/WebAssembly/simd/pull/383

Bug: v8:11265
Change-Id: Ied67d7b5b6beaaccac7c179ec13504482cb9c915
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2643562Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72297}

For now, that flag only avoid the installation of the 'WebAssembly'
global. Follow-up CLs will remove unneeded code from the binary if the gn
arg is not set to true.

R=ecmziegler@chromium.org, machenbach@chromium.org

Bug: v8:11238, v8:11344
Change-Id: Ie95b608ed12b0476470cb552138e369f863d249b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2646833
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Emanuel Ziegler <ecmziegler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72296}

This CL makes direct heap access consistent with the serialized mode by
correctly skipping optimizations if we encounter a FunctionTemplateInfo
that is unknown to the broker, because we haven't seen it during
serialization.

Bug: chromium:1158322
Change-Id: I10ad6f307bbd5a17f27890390179bd9e2d35418c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2639958Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72295}

This fixes an issue on 64-bit big endian architectures as discussed in
https://chromium-review.googlesource.com/c/v8/v8/+/2603925, where stack
slots always have the system pointer size, even with pointer compression
enabled.

Bug: chromium:1052746
Change-Id: I84030ba8bcde71cb1768bd7286314cf09c4dc640
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2645721Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72294}

Bug: v8:9871
Change-Id: I4084771cfc4d34f8e1b9d5265e115f9eac1098d8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2646165Reviewed-by: Dan Elphick <delphick@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Gus Caplan <snek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72293}

Change-Id: Ie4b673d7f56a62528c288c4684f8cc9822277587
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2461065Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Tamer Tas <tmrts@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72292}

There is no reason to allocate the vectors on the heap. Their
content will be heap-allocated anyway, and they are cheap to move
around.

Drive-by: Remove an unused counter.

R=thibaudm@chromium.org

Bug: v8:11164
Change-Id: I5660ecf5db7e8915a27255bae0215d5368c7d10e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2644937
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72291}

Also access the DescriptorArray through GetPropertyDetails concurrently
if the FLAG_turbo_direct_heap_access is on.

Bug: v8:7790
Change-Id: I13d12786399443ca1590dd87da7f371720acaa18
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2640421
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72290}

This reverts commit df5854c9.

Reason for revert: The v8-gn.h header file seems to be inconsistently rebuilt sometimes causing build failures: https://bugs.chromium.org/p/v8/issues/detail?id=11341

Original change's description:
> Reland "[build] Enable external flag header by default"
>
> This is a reland of d1da9694
>
> Relanding now that fixes for perfetto and cppgc are in:
> https://chromium-review.googlesource.com/c/v8/v8/+/2640458
> https://chromium-review.googlesource.com/c/v8/v8/+/2640480
>
> Original change's description:
> > [build] Enable external flag header by default
> >
> > Turns on v8_generate_external_defines_header.
> >
> > Bug: v8:11292
> > Change-Id: I4b1d9b47390b560b7cbf677948310694d8b03367
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2610966
> > Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> > Commit-Queue: Dan Elphick <delphick@chromium.org>
> > Auto-Submit: Dan Elphick <delphick@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#72201}
>
> Bug: v8:11292
> Change-Id: Ia47eeb6c45f4cc3db72c10782d677b69506fa3d6
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2642249
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Commit-Queue: Dan Elphick <delphick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#72226}

TBR=rmcilroy@chromium.org,delphick@chromium.org

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

Bug: v8:11292, v8:11341
Change-Id: I00719689e7a184e74699d074a01c10b4f462e553
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2647259Reviewed-by: Dan Elphick <delphick@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72289}

We did spawn exactly one task for each of copy&reloc and publishing.
Those tasks did block until work is available. This can block background
threads which could otherwise execute other component's work.
Switching to the Job API allows us to easily avoid that blocking, and
just respawning a task when more work is available.
Is always avoid code duplication for participating in the work in the
main thread. Instead we just {Join()} the existing job, which makes the
current thread participate in work.

For now, both Jobs set a maximum concurrency of one, so the main thread
will only do work if no background thread is currently running. This can
be lifted in a follow-up CL to see the performance impact of both
changes independently.

R=thibaudm@chromium.org

Bug: v8:11164
Change-Id: I032153eb933648a750b113f5d766feb85b87070a
Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_rel_ng
Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_isolates_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2643393Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72288}

According to the latest wasm-gc spec, the type immediate for the
argument's heap type is no longer required. This CL also adds a missing
check that the rtt immediate is a subtype of the argument's type.

Bug: v8:7742
Change-Id: I627002d1c4bdb4ca3f2181d2f4b659ce3e95cb2d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2642246
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72287}

This is a reland of 0ce0d934

This is a clean reland. The test failure on GC stress bot seems to be
related to GC timing and --stress-flush-bytecode.

Original change's description:
> [classes] Make sure parent classes are never turned to setup mode
>
> It doesn't make sense in general and moreover an attempt to do so might
> cause hard stack overflow.
>
> Bug: v8:11317
> Change-Id: I2a6bbadba1ebc5c1496660c734df76a13600edac
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2643389
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#72275}

Tbr: verwaest@chromium.org
Bug: v8:11317
Change-Id: Ic73efff7d9690c0edf7fa07b8b90691e9775a748
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2642461
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72286}

This allows embedders to specialize MakeGarbageCollectedTrait and
still get the static_asserts applied automatically, which avoids
bypassing the type constraints.

Bug: chromium:1056170
Change-Id: Ib24f8c6f5d8fb5ef1af4ca1af798f955fa253ba0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2647257
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72285}

Since snapshotting returns a vector of code pointers, we should add them
so the surrounding {WasmCodeRefScope}, to make sure that they are not
being garbage-collected while the serializer reads them.
This is unlikely to happen, since serialization is only triggered once
top-tier compilation is finished, and we usually do not garbage-collect
top-tier code, but in rare circumstances (e.g. in debugging), it could
theoretically happen.

R=ahaas@chromium.org

Change-Id: Ie1a9654a8a1467c12e42181776cec1dad7366036
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2644944Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72284}

Bug: chromium:1056170
Change-Id: If639b12e1cceec2d27355bb4cbf8c1fefa8b5038
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2642462
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72283}

- Use movl which clears the upper 32bits on x64
- Use xorl + movb for Smi.ptr values <= 0xFF, saving one byte over movl

Change-Id: Iacdacfbe397670667e71d1d12ef427a01994481d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2642250
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72282}

Functions that get hot quickly are more likely to stay hot and stable,
so optimize these functions earlier than the function that become
hot slower. To measure how "soon" the function gets hot this cl
introduces a global tick that is incremented whenever a function
registers a tick. We use the difference in the global tick between the
current tick and the last tick on that function to measure how soon
the function is becoming hot. We use the last tick to account for
functions that aren't used so much at the start but become hot
in a later phase. Currently we use this heuristic only for Turboprop
tierups. It is possible to extend this to extend this to Turbofan in
future.

Bug: v8:9684
Change-Id: I8ef265c03520274c68d56a9d35429531a3ba3d1d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2627850
Commit-Queue: Mythri Alle <mythria@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72281}