This reverts commit 2f8a7561.

Reason for revert: Speculative revert, lots of segfaults on Arm:
https://ci.chromium.org/p/v8/builders/ci/V8%20Arm%20-%20debug/17781

Original change's description:
> [dict-proto] C++ implementation of SwissNameDictionary, pt. 3
>
> This CL is part of a series that adds the C++ implementation of
> SwissNameDictionary, a deterministic property backing store based on
> Swiss Tables.
>
> This CL adds the initialization code, factory functions and a
> canonical SwissNameDictionary plus all helpers required for that.
>
> Bug: v8:11388
> Change-Id: I6bb92740afefc7d05433cfa62023e6da5e8213c7
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2688058
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Reviewed-by: Marja Hölttä <marja@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Commit-Queue: Frank Emrich <emrich@google.com>
> Cr-Commit-Position: refs/heads/master@{#72824}

Bug: v8:11388
Change-Id: Ia5dae584b0fb452b12c5d64ee63ffa418c83f91b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698758
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72829}

Change-Id: Ie7fbaebda580787a6261f0bc56fc1bde370148e4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698928Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72828}

After https://crrev.com/c/2695401, CachRegs needed to be defined
on PPC to overwrite the default value "0xff".

The default value was causing the following failure on some tests:

```
#
# Fatal error in ../../src/wasm/baseline/liftoff-register.h, line 160
# Debug check failed: 0 != kLiftoffAssemblerGpCacheRegs & reg.bit()
  (0 vs. 0).
```

Values are taken from `src/execution/ppc/frame-constants-ppc.h`.

Change-Id: Idfc1d0fdc20d0b5aabc25e5b5809a93073a2dc3d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698930Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72827}

Bug: v8:11374
Change-Id: Ia7845f92a6b7f98e310596b182ebad7a4a097878
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2697354
Commit-Queue: Marja Hölttä <marja@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Auto-Submit: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72826}

This missing include was undetected because trace_perf.cc is only
built if the checkout_google_benchmark custom gclient variable is
defined.

Bug: none
Change-Id: If2016edad4df382f14903593ea18066f7759c4d5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698387Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Chris Mumford <cmumford@google.com>
Cr-Commit-Position: refs/heads/master@{#72825}

This CL is part of a series that adds the C++ implementation of
SwissNameDictionary, a deterministic property backing store based on
Swiss Tables.

This CL adds the initialization code, factory functions and a
canonical SwissNameDictionary plus all helpers required for that.

Bug: v8:11388
Change-Id: I6bb92740afefc7d05433cfa62023e6da5e8213c7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2688058Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Frank Emrich <emrich@google.com>
Cr-Commit-Position: refs/heads/master@{#72824}

Allow filtering what functions compile with Sparkplug.

Bug: v8:11420
Change-Id: Ib70c4405687ec527109f2adbf87b58a51aae9870
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2700671
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72823}

Bug: v8:11429
Change-Id: If5d50cad91406d00e11ef8a6335dc492a4a38d57
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698671
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72822}

This is a reland of cf93071c

Original change's description:
> [interpreter] Short Star bytecode
>
> Design doc:
> https://docs.google.com/document/d/1g_NExMT78II_KnIYNa9MvyPYIj23qAiFUEsyemY5KRk/edit
>
> This change adds 16 new interpreter opcodes, kStar0 through kStar15, so
> that we can use a single byte to represent the common operation of
> storing to a low-numbered register. This generally reduces the quantity
> of bytecode generated on web sites by 8-9%.
>
> In order to not degrade speed, a couple of other changes are required:
>
> The existing lookahead logic to check for Star after certain other
> bytecode handlers is updated to check for these new short Star codes
> instead. Furthermore, that lookahead logic is updated to contain its own
> copy of the dispatch jump rather than merging control flow with the
> lookahead-failed case, to improve branch prediction.
>
> A bunch of constants use bytecode size in bytes as a proxy for the size
> or complexity of a function, and are adjusted downward proportionally to
> the decrease in generated bytecode size.
>
> Other small drive-by fix: update generate-bytecode-expectations to emit
> \n instead of \r\n on Windows.
>
> Change-Id: I6307c2b0f5794a3a1088bb0fb94f6e1615441ed5
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2641180
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#72773}

Change-Id: I1afb670c25694498b3989de615858f984a8c7f6f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698057
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72821}

Previously, ephemerons without a base_object_payload have been
filtered.  base_object_payload is currently used to differentiate
between GarbageCollected and just traceable objects, so we need to
pass on the empty descriptor.

Bug: chromium:1056170
Change-Id: I9cba53295779ec74dce2822b7bf83f477bc3241f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2700039Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72820}

Move the CompileWithBaseline interface to the Compiler class, as
CompileBaseline, which will do the additional work of pre-compiling
to bytecode, ensuring there is a feedback vector, and setting the
code on the function closure.

As a drive-by, fix v8_enable_trace_unoptimized to have a blank default
value, so that v8_enable_trace_ignition/v8_enable_trace_baseline_exec
can set it.

Bug: v8:11420, v8:11429
Change-Id: If715161de71f7d9300f3fdcbb50cc678b1fcdfdf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2697352Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72819}

Bug: v8:11344
Change-Id: I407e6a9afa0c813f9a41b5e7f0e6ff72f768ffea
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2699264Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Almothana Athamneh <almuthanna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72818}

R=ahaas@chromium.org

Bug: v8:8091
Change-Id: Ie3450c2a55d2fd272efc6c69632cf52a9aede597
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2699259
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72817}

Port af3c5307

Original Commit Message:

    This threads through a JumpMode kJump/kReturn to JumpCodeObject so we
    can use a return instruction to jump instead by first pushing the jump
    target and then using a return instruction.

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

Change-Id: I354329238d00503a234556f25adccd920d26d320
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2700036Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72816}

This prevents conflicts with e.g. --always-opt

Fixed: v8:11462
Change-Id: Ib98378a1bf620f5706bf3eef06f997bd994b1e2c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2700035
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72815}

Fixed: chromium:1178841
Change-Id: Ic91f5930476695bfc1767eac9140b8120935c9e7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2700171
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72814}

In case there's no exact match for the breakable location in
SetBreakpoint(), don't try to find the syntactically closest break
location, but rather find the first possible break location in bytecode
order. In particular when trying to set a breakpoint in a line with
for-of or an array destruction, there's no point in going for the
syntactically closest to the beginning of the line, but rather go for
the semantically first, as the intiution for setting a breakpoint on a
line is that the debugger stops before it executes anything on said
line. In the example

```
var [^a, ^b] = ^func();
```

there are three possible break locations, and the correct one is the
last one as the call to func will happen first at runtime.

For generators that's currently broken because of the implicit initial
yield, and same with modules (see crbug.com/901819), so we keep the
previous behavior of finding the closest breakable location, and will
fix that independently in a follow up CL.

Bug: chromium:901819
Fixed: chromium:782461
Also-By: yangguo@chromium.org
Change-Id: Ie724c5cb08e5f4edd90a450d99e001dff06bbe7a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2696586
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72813}

Pinned registers were not considered correctly when taking a volatile
register. This CL refactors handling of the pinned registers list by
combining the candidates list and the pinned list early. This avoid
additional parameters on some functions and might save some redundant
masking.
As a side effect, it also fixes the DCHECK error on arm.

R=ahaas@chromium.org

Bug: chromium:1179025
Change-Id: Ib9193b209c5741ea97fd1d0dffeeb9e824639439
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2699254Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72812}

We made two runtime calls: The first one allocated the exception object
containing a FixedArray of exception values, the second call did the
actual throw. Inbetween the code was filling the values array.
This CL refactors this to only allocate the FixedArray initially, fill
it, and then allocate the actual exception and throw it both from the
second runtime function.
This avoids a WasmGetOwnProperty call to find the values array.

R=thibaudm@chromium.org

Bug: v8:11453
Change-Id: I091aaa5c7bfb2b5579fc92c953adf582e6cc175a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2697359
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72811}

'catch_all' and 'else' use distinct opcodes now.

R=clemensb@chromium.org

Bug: v8:8091
Change-Id: If07e46b9ea23068953db1765d10c7e3746d21d99
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2699258
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72810}

During the string reverts a while back
https://chromium-review.googlesource.com/c/v8/v8/+/2633547 I reverted
some tests that were testing the code that was *not* reverted i.e. the
internalization of external strings.

Bug: v8:7790
Change-Id: I84964791cce712d753fd409cc3c641d9fbbb6550
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2699262Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72809}

Add baseline builtins for CreateAsyncFromSyncIterator and
GetImportMetaObject, and call those instead of the runtime functions.

Drive-by remove some TODOs in baseline-compiler.cc which are either no
longer planned or don't need to be done any time soon.

Bug: v8:11420, v8:11429
Change-Id: I15b4fe1f04316492045250b2c65ab6016f29b313
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2699261
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72808}

The csuite.py script does not work correctly on Windows. It runs
correctly in baseline mode, but there are two problems when running in
compare mode:

1. In compare mode the output of benchmark.py is piped to the
   compare-baseline.py script, but Windows only execute python files if
   python.exe is the default program to open '.py' files, and this is
   not the case, by default, when python is installed as part of the
   depot_tools.

   Fix: explicitly add the 'python' command before compare-baseline.py.

2. By default CSuite prints the results to stdout using escapes codes
   that add color highlights. But this does not work on Windows when
   compare-baseline.py is launched with a pipe:

   python test/benchmarks/csuite/benchmark.py <...> |
       python test/benchmarks/csuite/compare-baseline.py <baseline_results>

   Fix: Do not use a pipe. Write the benchmark numbers for the
   compare-run into a separate file, and pass the path to this file to
   compare-baseline.py

Change-Id: Ic22d5bd4b47901f0ba0f35bc2496441346d21c6a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2656855Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Paolo Severini <paolosev@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#72807}

The expected exception in this regression test is thrown due to a
limitation in the IrRegExp engine.
The experimental engine is unaffected and won't throw.

Bug: v8:11363
Change-Id: If37d86f5d4494b40c47ecc5e5bc4f86fda30389c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2699251
Auto-Submit: Patrick Thier <pthier@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72806}

Change-Id: Icdd2d4a178415d240a82378ffa575e6e6b79dca1
Bug: v8:11429
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2697353Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72805}

This threads through a JumpMode kJump/kReturn to JumpCodeObject so we
can use a return instruction to jump instead by first pushing the jump
target and then using a return instruction.

Bug: v8:11429
Change-Id: I8658ed9c5bade28bd6efc76e26fd92bad22b3c68
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2697196
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72804}

This reverts commit e27b7b60, which was
a workaround. The original problem is not reproducible anymore.

Bug: v8:9717
Change-Id: I11e165d7ec9643ec805ab8c075b720b58e7769bb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2699249
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72803}

Bug: v8:11429, v8:11461
Change-Id: Iffe9ac09eea008b45a6b9734a3c78ac8ba508222
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2699253
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72802}

Bug: v8:9717
Change-Id: I2338e11ec8263b18e60eb5206431738a8532c977
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2699248
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72801}

Change-Id: I9eb86c5ca40734ec61864bce7d0f757fcd4b7d93
Bug: v8:11429
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2697205Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72800}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/bc28354..a42736b

Rolling v8/buildtools: https://chromium.googlesource.com/chromium/src/buildtools/+log/228b1c1..fe293b0

Rolling v8/third_party/aemu-linux-x64: AFb5I0J9LTvrxaixyFmiKgTuOLLQ3YJ_FAEwRZq1basC..9VxcXi3GhpRxrjwHQwa801vcevGa1Pew2lw1KkUkgmgC

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/35976bf..832539c

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/7386a1e..0391863

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/dbe0d80..823dc87

TBR=v8-waterfall-sheriff@grotations.appspotmail.com

Change-Id: Idc687f5ee60652f381dca0c9d0f7c8293ea6a73a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2699354Reviewed-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@{#72799}

Bug: v8:11416
Change-Id: I0c993ee564358f5c5f8880cbae1bce9ff2128087
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698308
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Reviewed-by: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72798}

Bug: v8:11415,v8:11348,v8:11416,v8:11347
Change-Id: I0c945ecf10264fdaf90dab7b854cb2392976a8ff
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2693988
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72797}

Bug: v8:11415
Change-Id: I0101d88d19e5cad20d5f0fa6926cf0ebd9d000e9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698091
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#72796}

Bug: v8:11265
Change-Id: I133c050a4d4c479c2d5adb1b95ef758d2875e773
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2692731Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72795}

samples being discarded

 - Passed in as CpuProfilingOptions parameter, client is responsible for
determining if function is still safe to execute. Includes unit tests

 - Client (blink) side CR: https://chromium-review.googlesource.com/c/chromium/src/+/2649617,
 - Client (blink) side CR requires this to be pushed prior to it being pushed

Change-Id: I3ef4640186115d4e14c1b73f902c889c776e310f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2652206
Commit-Queue: Nicolas Dubus <nicodubus@fb.com>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72794}

Bug: v8:11416
Change-Id: I094e91b1e5b382e5eced24d198e1f6bbc1b4ae0f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2686311
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72793}

Change-Id: I9241573c3644918028e2b302da2988cca0973cb8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698089Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72792}

Port adf035fb

Original Commit Message:

    This CL avoids redundant loads of the instance from the frame by caching
    it in a register if possible. This register will be the first one to be
    cleared once we run out of registers (hence it's called a "volatile
    register"). On local tests, this seems to reduce most redundant loads
    within a function, and it also reduces the load for the stack check in
    the function prologue.
    After the stack check, we need to discard the cached instance though,
    since the potential runtime call for the stack check might clobber it.
    This will be addressed in a follow-up CL by re-loading the cached
    instance after the stack check. This is expected to remove another good
    chunk of instance loads, because the instance would initially be
    available in a register when starting the function code.

R=clemensb@chromium.org, midawson@redhat.com, mfarazma@redhat.com
BUG=
LOG=N

Change-Id: I3756ce98d4dfefb44c946a4948f1a6dbe0ce44dd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698291Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72791}

R=clemensb@chromium.org

Bug: v8:8091
Change-Id: I2933342da65ef75cfe36f81f8828411fd78d45e8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2696659
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72790}