Change-Id: Ib07ad54ef20877597dcf50a995a8f8a8e8dcb1c3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809816Reviewed-by: Martyn Capewell <martyn.capewell@arm.com>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63877}

Disabling the RegExp compilation cache comes with performance implications,
and it doesn't seem to be necessary for debugging.

Bug: chromium:992277
Change-Id: I24841f4814bcacb18a3968c37490f201c0c1ccac
Cq-Include-Trybots: luci.chromium.try:linux-rel,win7-rel
Cq-Include-Trybots: luci.v8.try:v8_linux_gc_stress_dbg,v8_linux64_gc_stress_custom_snapshot_dbg_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1805637
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63876}

WASM only supports Little-endian byte ordering and we need a mechanism to
reverse the ordering efficiently on Big-endian machines.
Up until now this was done using TF graphs within wasm-compiler.
The new approach allows for having more machine level optimizations
by introducing the new "kSimd128ReverseBytes" opcode which gets executed
only on Big-endian machines.

Change-Id: I63c6c3c42ca9ff9d9b2af2d45070a70cf1b3cefc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1803494Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#63875}

On-heap typed arrays contain HeapObject value in |base_pointer| field
and an offset in |external_pointer| field. When pointer compression is
enabled we want to combine decompression with the offset addition.
In order to do that we add an isolate root to the external_pointer value
and therefore the data pointer computation can is a simple addition of
a (potentially sign-extended) |base_pointer| loaded as Tagged_t value
and an |external_pointer| value.

Bug: v8:9706
Change-Id: Id5c546c353c81fb25e3598921bc78165d10a9c44
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807369Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63874}

We see crashes in the wild, however the minidump does not contain enough
information for properly investigating this. This is temporary code
that should be deleted as soon as possible.

Bug: chromium:1004365
Change-Id: I25e119d891e03f980d63f5d559fcb4429b574cb1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809373
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63873}

The serialization step in the pipeline gets an initial zone, and thus
far, it's allocated all of it's hinting information in that zone.
However, much of this comes from stepping into calls and
walking the bytecode of the called function. Once we finished
recursing into a call, we should be able to throw all those
hints away -- they've served their purpose, and the "output"
of their work is a set of new objects made visible to the broker.

Therefore, we should create and destroy a child zone.

On a run of typescript, this reduces absolute max (high water mark)
allocation of the serialization phase from 10 MB to 5 MB.

Bug: v8:7790
Change-Id: Icbb35abed28b1a924328541df82be23594152a8f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1800570Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63872}

This fixes the issue highlighted in
https://chromium-review.googlesource.com/c/v8/v8/+/1803236.

Change-Id: Iea2d6c4f9585a56d017f2cb1eb8e23b52de1f795
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807356
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63871}

This introduces {GetContainingWasmFunction} to replace the above method,
since calculating offsets into the wire bytes is independent of the
concrete module object and hence only needs the shared decoded module.

R=clemensh@chromium.org
BUG=v8:6847

Change-Id: I145d527506289686653979dbb135480cc42ea4c8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809369
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63870}

Bug: v8:6949
Change-Id: I47f6832a01b7090229c80163012f3874d15d831f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809358
Commit-Queue: Dan Elphick <delphick@chromium.org>
Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63869}

... and do not artificially add at least one dummy.js file.

Until this CL we used to ensure the existence of at least one 'extra
native' by appending a short dummy.js file if v8_extra_library_files
was empty. This file is uselessly compiled and run at startup.

This CL removes that mechanism along with a minor tweak to handle an
empty natives blob.

Bug: v8:9736
Change-Id: I05bf7c54380e77a9105d5c1a1a76983c692faf60
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809372
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63868}

Separate creating Wasm translations from reporting them to an agent.
This is done in order to support multiple connected sessions.

Previously connecting more than one agent would fail assertion in debug
mode and overwrite translation objects over and over
(and potentially do something worse) in release mode.

Bug: v8:9725
Change-Id: I13fde5ebf6e64e7268eb6870f9c21ac9a5bed81e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807273Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Ingvar Stepanyan <rreverser@google.com>
Cr-Commit-Position: refs/heads/master@{#63867}

During deletion in the write-back phase, we do not necessarly need
to check with HasOwnProperty before calling DeleteProperty. Since this
is observable behavior when using proxies, we remove the HasOwnProperty
check to mirror more closely what Spidermonkey does.

R=jgruber@chromium.org

Change-Id: I67768b1d8b13e695b956b2fa0624dcb28fd0664d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809366Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63866}

BUG=v8:6949,v8:9396,chromium:1004912

Change-Id: Ifa8207283aadad258281bffda6d49da574402a24
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809370
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Auto-Submit: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63865}

In the mjsunit/wasm/asm-wasm-f32 test, {IsValid} caused 10% of the
overall runtime. In absolute numbers, {IsValid} wasm called more
than 6.000.000.000 times. I moved the calls to {IsValid} from
before-use to after-modification. I removed the calls in {Combine}
and {Remove}, because these operations cannot create an invalid
CPURegList.
These changes reduce the number of calls to {IsValid} to about
100.000.000 in the test mentioned above, and saves for that test
about 10 seconds out of before 2 minutes absolute runtime.

R=v8-arm-port@googlegroups.com

Bug: v8:9396
Change-Id: If3059f471e423405ec6f34ddef89e314dee1cbaf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1801851
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Martyn Capewell <martyn.capewell@arm.com>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63864}

This is an unmodified reland of
60624b56. Nosnap bots do not block
LKGR any more: https://crbug.com/v8/9737#c10.

Original change's description:
> Disallow nullptr arguments for {CopyChars}
>
> This allows to remove special casing for the {count == 0} case, which
> was needed because {memmove} does not accept {nullptr} arguments even
> if the {count} is zero.
>
> R=leszeks@chromium.org
>
> Bug: v8:9396
> Change-Id: Iaef3cdbbffa74c2ba1c4e4501dafd943282cbcd9
> Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807366
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#63838}

TBR=leszeks@chromium.org

Bug: v8:9396
Change-Id: I6ab13575f13df060b450ff105e4b9db516671dcf
Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809365Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63863}

This introduces {GetWasmFunctionOffset} to replace the above method,
since calculating offsets into the wire bytes is independent of the
concrete module object and hence only needs the shared decoded module.

R=clemensh@chromium.org
BUG=v8:6847

Change-Id: I6818de4589e26dd8f69dfb71d15bbca127c7ee3e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809368Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63862}

TNodify related methods in CSA:
 * TaggedToWord32OrBigInt
 * TaggedToWord32OrBigIntWithFeedback
 * TaggedToWord32OrBigIntImpl

Remove Sloppy-ness in RelationalComparison

Bug: v8:6949
Change-Id: I970a40a424f6e8cdc45544eb79c95291a5a5a608
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807362Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63861}

This introduces {DisassembleWasmFunction} to replace the above method,
since disassembling a function is independent of the concrete module
object and hence can be done for shared decoded modules.

R=clemensh@chromium.org
BUG=v8:6847

Change-Id: I5abea2a1381a9b8d3717a55d0b2b937dfbbafefd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809359
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63860}

This is a first step towards being able to share the same script for
multiple {WasmModuleObject} objects. In general it should be possible
for the inspector to debug (i.e. disassemble, set breakpoints) multiple
modules if they all have the same URL (and the same wire bytes). These
are the same conditions under which we can canonicalize the modules to
be based on the same underlying {NativeModule} as well. Hence it makes
sense to establish a link from {Script} to {NativeModule} in this CL.

Subsequent CLs will eventually deprecate the {wasm_module_object} field.

R=clemensh@chromium.org
BUG=v8:6847

Change-Id: I5cfb617e18d9b06682e6437b2a2146ea5665c1c6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807371
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63859}

This hopefully fix the regression test from c693e005

Bug: v8:1004766
Change-Id: If3c554070af6b795e4b3f99cd592a62453028874
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809363Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@google.com>
Cr-Commit-Position: refs/heads/master@{#63858}

This is an unmodified reland of
9febc505. Nosnap bots do not block
LKGR any more: https://crbug.com/v8/9737#c10.

Original change's description:
> Reland "Remove all custom CopyCharsUnsigned implementations"
>
> This is a reland of 5d8c4890
>
> Original change's description:
> > Remove all custom CopyCharsUnsigned implementations
> >
> > It's unclear whether the custom implementation have any advantage over
> > the standard library one's.
> > Since we update our toolchain and standard library regularly, it might
> > well be the case that the custom implementations are slower by now.
> >
> > Thus this CL removes all {CopyCharsUnsigned} implementations and
> > implements {CopyChars} generically using {std::copy_n}.
> >
> > Note that this does not touch the {MemMove} and {MemCopy} functions
> > yet, as we have seen regressions when trying to remove them before
> > (https://crbug.com/v8/8675#c5).
> >
> > R=leszeks@chromium.org
> >
> > Bug: v8:9396
> > Change-Id: I97a183afebcccd2fbb567bdba02e827331475608
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1800577
> > Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> > Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#63808}
>
> Bug: v8:9396
> Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng
> Change-Id: I9cd754ebe6b802bb4aabd6d2a448de41da040874
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807357
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#63823}

TBR=leszeks@chromium.org

Bug: v8:9396
Change-Id: I793524d76b8b9c93d2a98c73e8d72967880fe1cf
Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809362
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63857}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/3bf1aad..aae0a7b

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/b19a360..b4e53c4

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/2c210a4..6f9a023

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

Change-Id: I397f67e56c63bf89744a6d12729cb017023a8acc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809568Reviewed-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@{#63856}

ArrayBuffer tracking has landed, turning on GrowMemory for Shared
WebAssembly.memory on by default. Enable all variants of tests based
on the new implementation.

Bug: v8:8564, v8:9221, v8:8832
Change-Id: I0ff8688636303896450b788b2ff5a7268d386050
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1808106
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63855}

This reverts commits 9febc505
(along with followup commit 60624b56).

Reason for revert: Breaks win32 nosnap shared, blocking lkgr & roll:
https://ci.chromium.org/p/v8/builders/ci/V8%20Win32%20-%20nosnap%20-%20shared/35145

nosnap bots may be deprecated, but as long as they're in LKGR
we need to mind them.

Original change's description:
> Reland "Remove all custom CopyCharsUnsigned implementations"
>
> This is a reland of 5d8c4890
>
> Original change's description:
> > Remove all custom CopyCharsUnsigned implementations
> >
> > It's unclear whether the custom implementation have any advantage over
> > the standard library one's.
> > Since we update our toolchain and standard library regularly, it might
> > well be the case that the custom implementations are slower by now.
> >
> > Thus this CL removes all {CopyCharsUnsigned} implementations and
> > implements {CopyChars} generically using {std::copy_n}.
> >
> > Note that this does not touch the {MemMove} and {MemCopy} functions
> > yet, as we have seen regressions when trying to remove them before
> > (https://crbug.com/v8/8675#c5).
> >
> > R=leszeks@chromium.org
> >
> > Bug: v8:9396
> > Change-Id: I97a183afebcccd2fbb567bdba02e827331475608
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1800577
> > Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> > Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#63808}
>
> Bug: v8:9396
> Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng
> Change-Id: I9cd754ebe6b802bb4aabd6d2a448de41da040874
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807357
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#63823}

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

Change-Id: Ic53ab2293d5dc7722a1121d1aa1159328a6ed8f5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:9396
Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1808035Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63854}

NOTRY=true

Bug: v8:7834
Change-Id: I84bd68dd6e94a882a1c20075b9b23ba08dab4136
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1801257
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63853}

Runtime_CreateRegExpLiteral pretends to handle the case where we
already have a boilerplate but the code just passes an empty handle
to JSRegExp::Copy. This CL replaces the code with a CHECK that the
boilerplate doesn't exist.

A few mostly cosmetic changes along the way.

Change-Id: I856c77c1cdf58f09e920b773b66b037c5178edc7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809357Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63852}

Bug: v8:8976
Change-Id: Iede3b662188392303949edf2a9f0c585976695ab
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1806100
Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63851}

Fix m(ax|in)imumFractionDigits of Intl.NumberFormat
resolvedOptions are set to 0. For example, currency
instance for CPY or KRW.

Bug: chromium:1003748
Change-Id: Ia1963d8d070b066bd5afa61f8c4716a21450af05
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807742Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63850}

The promise file is too big so I am splitting it in several CLs.
This is the first one.

TNodified:
 * AllocateAndInitJSPromise (three versions)
 * PerformPromiseThen
 * AllocateJSPromise

Bug: v8:6949
Change-Id: I57ae8de3f929c00a9127ea4be51ffe7703b44959
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807370
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63849}

Bug: v8:6949, v8:9396
Change-Id: I035a00f61077e49377c9cd39ae1b216a80c98e6b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1803615Reviewed-by: Dan Elphick <delphick@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63848}

This moves PointerToSeqStringData from CSA to IntlBuiltinsAssembler
since that the only place it's used and converts a few Node*s to TNodes.

Bug: v8:6949, v8:9396
Change-Id: I2511c9f807fa0bc3101dd531f6724a170fed6bd9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807372
Commit-Queue: Dan Elphick <delphick@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63847}

One Node* remains since it is crashing when TNodified since it
has the empty Context. When this happens, it means the Context
might not be needed. In this case it's hard to see if that's the
case since it is propagated all over the place. Created a TODO
so we can solve it later, when TNodification is more complete.

Bug: v8:6949
Change-Id: I7db8c507689e30779f102a8272e1b13ecdc3e5e9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807274Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63846}

BUG=v8:6949,v8:9396

Change-Id: Icd65e16f6b5b41ad56d1b8767a73e8ca15d05b74
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807365
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63845}

Bug: v8:9713
Change-Id: I80b8f72ce4617b314f6c4991297a6464f67cbbec
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807364Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63844}

Bug: v8:6949
Change-Id: Ia45fe97ff67cd32f5d3e94d93b270dc3fef04244
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1805649
Auto-Submit: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Reviewed-by: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63843}

Port 1dd791fc

Original Commit Message:

    Uses templates to dispath the allocation flag statically.

Change-Id: I1d6a0f2c6ca04ac0f03afe392584e9f1e8dcfb9a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1806680
Auto-Submit: Mu Tao <pamilty@gmail.com>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63842}

- Makes accessor and iteration methods on Arguments and derived
  classes const.

Bug: v8:9429,v8:9396
Change-Id: I47b3d95ab72e689327a0d7b6a36a08b4e63f6d95
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1803336Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63841}

Bug: v8:9717
Change-Id: I0d99cb8f8dedd22dae9f78b49a097e3dcbba02bb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807368Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63840}

Bug: v8:9463
Change-Id: Ie36fc1b04b81dd091c4526123bee50d6b22d6917
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807044
Commit-Queue: Joshua Litt <joshualitt@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63839}

This allows to remove special casing for the {count == 0} case, which
was needed because {memmove} does not accept {nullptr} arguments even
if the {count} is zero.

R=leszeks@chromium.org

Bug: v8:9396
Change-Id: Iaef3cdbbffa74c2ba1c4e4501dafd943282cbcd9
Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807366Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63838}