Port 8a0d1b6f

Original Commit Message:

    Modernise the RegList interface to be a proper class, rather than a
    typedef to an integer, and add proper methods onto it rather than ad-hoc
    bit manipulation.

    In particular, this makes RegList typesafe, adding a DoubleRegList for
    DoubleRegisters.

    The Arm64 CPURegList isn't updated to use (or extend) the new RegList
    interface, because of its weird type-erasing semantics (it can store
    Registers and VRegisters). Maybe in the future we'll want to get rid of
    CPURegList entirely and use RegList/DoubleRegList directly.

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

Change-Id: I997156fe4f4f2ccc40b2631d5cb752efdc8a5ad2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3525084Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#79484}

Bug: chromium:1306416
Change-Id: I103602ed1bea71d79a17a9a37c7eaf198575d371
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3521944Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Almothana Athamneh <almuthanna@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79483}

It turned out that on arm and arm64 we over-estimated the code size of a
Wasm module quite a bit. This CL adds some more output for the
--trace-wasm-compilation-times flag, and adds a script to compute the
factors we use for code size estimates from that output.
I ran the script on a few benchmarks (an older Epic module, the current
Photoshop module, and the benchmark from the linked bug), and adjusted
the constants accordingly.

Also, simplify the API of {ReservationSize} to only return a single
number, and fail internally if we need to allocate more than the engine
supports (which would only fail for artificially large modules).

R=jkummerow@chromium.org

Bug: chromium:1302310
Change-Id: I5b2c27ff3e360fb6738cf5dd697bcee09e106b6d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3522067Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79482}

This CL adds a missing header that was implicitly included by
"test/cctest/wasm/wasm-run-utils.h", which resulted in test failure
with v8_enable_webassembly = true.

Drive-by: Improve traceability of the fastcall cctests.

Bug: chromium:1052746
Change-Id: I4cafbce2e390958befee896782ad13a9bdfc0f30
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3525113Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79481}

R=machenbach@chromium.org,alexschulze@chromium.org,almuthanna@chromium.org,liviurau@chromium.org

Bug: chromium:1298869
Change-Id: Ia08f5069bacf5134ba56265d64eff527d7dd96fb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3525134
Commit-Queue: Tamer Tas <tmrts@chromium.org>
Auto-Submit: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79480}

Fix compilation issue in ia32.

Change-Id: I7603a3bcebda0faf4e44d02e6c22601f7531a7aa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3516746
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79479}

Bug: v8:12709
Change-Id: Ia353ce364546fc34ca6b93a9873a20630a8085a5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3523045
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79478}

Format strings are the convention in Py3

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

Bug: chromium:1298869
Change-Id: Ia660e933f07d2a592c2edadaa99df68c47adb80d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3521789
Auto-Submit: Tamer Tas <tmrts@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79477}

No-Try: true
Bug: chromium:1292013
Change-Id: Id9966157d28528b28e820d328b4941287a310209
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3521790Reviewed-by: Liviu Rau <liviurau@chromium.org>
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79476}

This CL fixed cmpq in TestMoveSmi by using cmp_tagged and further
optimizes Move(Register, Smi) for 31-bit negative Smi.

To move a Smi of -1 to register, the disassembly before the commit is as:
48c7c0feffffff    REX.W movq rax, 0xfffffffe

The disassembly after the commit is as:
b8feffffff        movl rax, 0xfffffffe

Bug: v8:12696
Change-Id: I6fafeec7959491ba8b084acf797c58910c2928fa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3514654Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Haoyu Zhang <haoyu.zhang@intel.com>
Cr-Commit-Position: refs/heads/main@{#79475}

This reverts commit 6e2c9bb2.

Reason for revert: Fails layout test: external/wpt/wasm/serialization/arraybuffer/transfer.window.html

Original change's description:
> [serialize] copy bytes for non detachable array_buffer
> in WriteJSArrayBuffer when array_buffer is not in
> array_buffer_transfer_map_
>
> According to https://html.spec.whatwg.org/multipage/structured-data.html#structuredserializeinternal
> steps 13.3.2-4, should normally serialize array buffer which
> is not detachable
>
> Bug: v8:12703
> Change-Id: I4554c5d07ae85e1a96a728ebba04c6a071575f6f
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3518910
> Reviewed-by: Marja Hölttä <marja@chromium.org>
> Commit-Queue: Marja Hölttä <marja@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79466}

Bug: v8:12703
Change-Id: I548ab191ab7d0f8fa699958396a5e32e34d39568
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3524742
Auto-Submit: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#79474}

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/4f77cf9..9a71e5d

Add BENCHMARK_STATIC_DEFINE to the Python bindings' `cc_binary` local defines. (#1369) (Nicholas Junge)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/9a71e5d

Update LICENSE file to clearly state which file needs BSD 3 (#1366) (Vy Nguyen)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/4a1943d

R=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com,mlippautz@chromium.org

Change-Id: Ib3d07292d03783c5c473df650011c4acb867449a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3524089
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Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/5d2dc59..18a1f19

Rolling v8/buildtools/linux64: git_revision:f27bae882b2178ccc3c24f314c88db9a34118992..git_revision:bd99dbf98cbdefe18a4128189665c5761263bcfb

Rolling v8/buildtools/third_party/libc++abi/trunk: https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxxabi/+log/289d52c..a897d0f

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/b326cac..63a615b

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/c848a4e..3481645

Rolling v8/third_party/googletest/src: https://chromium.googlesource.com/external/github.com/google/googletest/+log/ae1b7ad..ae5e06d

Rolling v8/third_party/zlib: https://chromium.googlesource.com/chromium/src/third_party/zlib/+log/85bdd64..b0676a1

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Change-Id: I7178731823e068efe7bd23b862d60b4f4f701bc6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3524088
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Port: c69b0c80

Change-Id: Ie29079f976c7ab6fa14e5edc1da296a9e75b1bcf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3523822Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#79471}

This CL moves the call to GCTracer::StopCycle for the full GC from
Heap::CompleteSweeping full, which is called to force sweeping to
finish, to GCTracer::NotifySweepingComplete, which is called as soon
as sweeping finishes --- and symmetrically to a new method
GCTracer::NotifyCppGCCompleted, which is called as soon as sweeping
of the managed C++ heap finishes. In this way, a full GC cycle is
reported as soon as sweeping is finished both for the V8 and the C++
managed heap.

The changes introduced in this CL are essentially a partial revert of
https://crrev.com/c/3456563, fixed in such a way that when the full
GC cycle is reported, the current tracer event will be the correct
one corresponding to that cycle.

Bug: v8:12503
Bug: chromium:1154636
Change-Id: Icea07cf35a9565994e798b0500e9da72cd95f9ac
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3497318Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Nikolaos Papaspyrou <nikolaos@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79470}

This reverts commit 3d5d99ff.

Reason for revert: causes this crash: https://bugs.chromium.org/p/chromium/issues/detail?id=1303458

Original change's description:
> [compiler] let InstructionSelector duplicate branch conditions
>
> Bug: v8:12484
> Change-Id: I44c2028efadbd70e7711f01d107995e0462f05d4
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3477094
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Commit-Queue: Darius Mercadier <dmercadier@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79239}

Bug: chromium:1303458, v8:12484
Change-Id: I129467bcb2507f2fba894f5dd58304eb139f739c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3522069Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Darius Mercadier <dmercadier@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79469}

strict parameters error before parse parentheses expression
in ParsePrimaryExpression

clear last next_arrow_function_info tracked strict
parameters error, avoid throw syntax error when parse
arrow function nested in a parentheses expression.

Bug: v8:12688
Change-Id: Ib190ff5e04c9a83329c59421e9dd44f5a5907b07
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3516729Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79468}

Bug: v8:7700
Change-Id: Ib3b3f453e162e0913b8077ac8f8b9e2273deaed9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3521783
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79467}

in WriteJSArrayBuffer when array_buffer is not in
array_buffer_transfer_map_

According to https://html.spec.whatwg.org/multipage/structured-data.html#structuredserializeinternal
steps 13.3.2-4, should normally serialize array buffer which
is not detachable

Bug: v8:12703
Change-Id: I4554c5d07ae85e1a96a728ebba04c6a071575f6f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3518910Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79466}

Running `OS::AllocatePageSize()` on PPC simulator (which
runs on x64 Linux) will make a `sysconf(_SC_PAGESIZE)` call
which returns the native x64 Linux page size and not the PPC
specific page size.

This can cause a problem if used along side the current value of
`kPageSizeBits` which is set to use PPC value even on Sim.
As an example a newly added DHCECK under https://crrev.com/c/3497363
was failing on PPC Sim as a call to `AllocatableMemoryInDataPage`
was being made which used kPageSizeBits on Sim.

Meanwhile another function was using the `page_size_bits` value which
gets set by _SC_PAGESIZE. The mismatch caused an incorrect final value
being generated which failed the DCHECK.

Change-Id: Iaf2d9cff16bbe5f6be5f3ec6a13b99be94776f48
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3519758Reviewed-by: Junliang Yan <junyan@redhat.com>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#79465}

The fuzzers were passing the flag --es-staging which doesn't exist. This
CL updates them to pass the flag --harmony which does exist.

Change-Id: I02c83026e5b9bdf49e51e700f16702bf56cd49e8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3522064Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79464}

If a value is in multiple registers, pick one of them to be freed.

Bug: v8:7700
Change-Id: I1886b977187b4d8e939ff106edde4ccf716661d7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3522063
Auto-Submit: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79463}

The CL implements binary operations bytecodes as generic nodes that
call the correspondent runtime builtin.

Bug: v8:7700
Change-Id: I82c5e20e4103d4ef367184af1242bae7f7f93fe0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3509392Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79462}

- inline Array.prototype.indexOf in js-call-reducer
- inline Array.prototype.includes in js-call-reducer

Bug: v8:12390
Change-Id: Idb5669da3019f0f56af0084fccd1d616d4c5098e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3473994Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79461}

Modernise the RegList interface to be a proper class, rather than a
typedef to an integer, and add proper methods onto it rather than ad-hoc
bit manipulation.

In particular, this makes RegList typesafe, adding a DoubleRegList for
DoubleRegisters.

The Arm64 CPURegList isn't updated to use (or extend) the new RegList
interface, because of its weird type-erasing semantics (it can store
Registers and VRegisters). Maybe in the future we'll want to get rid of
CPURegList entirely and use RegList/DoubleRegList directly.

Change-Id: I3cb2a4d386cb92a4dcd2edbdd3fba9ef71f354d6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3516747
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79460}

Instead of implementing ExternalObjects as plain JSObjects with a single
EmbedderDataSlot pointing to a Foreign containing the actual raw
pointer, this CL now creates a new JSExternalObject type that directly
contains the external pointer.

As a side-effect of this refactoring, nullptr values are now no longer
valid for ExternalObjects.

Change-Id: Ic8ff334681c966e823ca70f34dd1efaaa21a0789
Cq-Include-Trybots: luci.v8.try:v8_linux64_heap_sandbox_dbg_ng,v8_linux_arm64_sim_heap_sandbox_dbg_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3513234Reviewed-by: Igor Sheludko <ishell@chromium.org>
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Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Samuel Groß <saelo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79459}

Bug: v8:11525
Change-Id: I582f17d6ecfa47394bc29692f788c5119aac5ce9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3516745Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79458}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/43a4f0e..5d2dc59

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/271796d..b326cac

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Change-Id: I1c8b08d850885bbadbd471a770211f1e98f8ba21
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3517971
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This CL fixes a deopt loop that might happen in case of mixing
Number with BigInt in bitwise binary operations.

Bug: v8:12693
Change-Id: Ib6a08d0c74a954ade3719bd6bd49ca2988d88e69
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3505542Reviewed-by: Leszek Swirski <leszeks@chromium.org>
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Commit-Queue: Jianxiao Lu <jianxiao.lu@intel.com>
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Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/705202d..4f77cf9

Fix float comparaison and add float comparison warning (#1368) (Bensuperpc)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/4f77cf9

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Change-Id: Ibe4d4953920ea1415fadaca1a636750f9590c881
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3520366
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Change-Id: I03b8c3002da073209e092ba1204646ad7f856aeb
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Change-Id: I4378e4f99c6b034f7b29782218896d5485178109
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3514656
Auto-Submit: Yu Liu <liuyu@loongson.cn>
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Change-Id: I23b76ec7bdf0f1997815f4928d903a9807413129
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3516829Reviewed-by: ji qiu <qiuji@iscas.ac.cn>
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Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/a25f3cd..705202d

Add PyPI upload job to wheel building workflow (#1359) (Nicholas Junge)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/705202d

R=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com,mlippautz@chromium.org

Change-Id: Ib5833d20ced99bd3b949e2df848a300511087df1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3517453
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vector register has different register file from float register in Risc64 rvv extension.
So this cl add third FPalising kind INDEPENDENT to allocate independently simd register.

Bug: v8:11976

doc: https://docs.google.com/document/d/1UwmUwOI3eeIMYzZFRmeXmfyNXRFHNZAQ4BcN0ODdMmo/edit?usp=sharing

Change-Id: I0fb8901294b4bc44b0bee55e630b60460e42bef2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3383513Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
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Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/ea42de6..797674d

Rolling v8/buildtools/linux64: git_revision:46f94b5a7f5527b5d7ef57271d3e9447a65e22ac..git_revision:f27bae882b2178ccc3c24f314c88db9a34118992

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/5b79b29..271796d

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/37db69d..c848a4e

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/548c235..85f3c90

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Change-Id: I296568003a80edfc45f05bd7af9ccf1715df1103
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when BuildCreateArrayLiteral

In spread calls, create array literal boilerplates for
BuildCreateArrayLiteral rather than emit array literals
without any boilerplates

Bug: v8:11582
Change-Id: Ia0538bd043eab040c3059440e982c7f0037d1a3f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3507126Reviewed-by: Leszek Swirski <leszeks@chromium.org>
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Explicitly #include climits header for CHAR_BIT.

Bug: v8:12691
Change-Id: I9d7a28543883a5387e006c4b6ee4491243a06207
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3516925
Auto-Submit: Dominik Inführ <dinfuehr@chromium.org>
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The scope can be (and is) used by compiler threads, i.e. not just by the
main thread; update the comment.

Change-Id: Ifbeb414761cee4ab12dd953f0cd544f35c92fc8a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3516037
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