- Minor improvements to the documentation for snapshotting.
- Add newlines to printed errors where necessary.

Change-Id: I822e7e850adb67eae73b51c23cf34e40ba3106f0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144954Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67111}

Change the unittests Isolate mixin to create one Isolate per test,
rather than one per test suite. We usually run these tests independently
in separate processes anyway, so this shouldn't affect normal test
execution, but it will avoid Isolate state leaking across tests when
running the unittests binary directly.

Take this opportunity to also clean up the mixins, changing counter
initialization and forcing pointer compression into template traits.

Bug: v8:10142
Change-Id: If92046f9c6f2056252d099faed04d97844ef7319
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2143818Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67110}

Provides the infrastructure to register weak callbacks for
WeakMember<T> through visitor. The WeakCallbackInfo broker is used to
query objects for liveness. In a future CL the same broker object is
passed to custom weak callbacks.

Change-Id: I8b5a66354e0e457521989d40ae64a9558c339503
Bug: chromium:1056170
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2142265
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67109}

Bug: v8:10371, v8:10396
Change-Id: I55359ac5d96369962d472f8a7e5d01303b823be0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2145240
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67108}

Introduce LivenessBroker which is a temporary broker object to expose
liveness during specific garbage collection phases.

This broker can be used to handle:
- PreFinalizer
- Custom weak callbacks
- Internal weak callbacks used for WeakMember

Change-Id: I3870c2b89b2538f04feabf2eb7a4676ce2fe7d61
Bug: chromium:1056170
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144059Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67107}

This adds ownership of tests.

Bug: chromium:1056170
Change-Id: Ibed6ee0024d34c886817d273660922d5cc6865ec
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2141734Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67106}

Port c054847d
https://crrev.com/c/2131323

Change-Id: I21e534399eed573affd3bf65004b3e570c549ff4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2147573Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#67105}

As a drive-by, the order of rounding_average_u is adjusted according to src/wasm/wasm-opcodes.h.

Bug: v8:9909
Change-Id: Ia3a2ed5869f8df8a2191afa034e0b9438de98bc5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2141654Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhiguo Zhou <zhiguo.zhou@intel.com>
Cr-Commit-Position: refs/heads/master@{#67104}

v8.1 has a stability issue where we free code too early. Thus disable
for now, such that we can merge this back to v8.1.
v8.2 does not have this problem, since https://crrev.com/c/2078583 fixed
it. This CL is not easily backmergable though.

R=tebbi@chromium.org

Bug: chromium:1070199, chromium:1070182
Change-Id: I4bf468b3e7b5b1e66b314907f844d4195b3ff029
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144966
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67103}

Port 445f9ef1
https://crrev.com/c/2107511

Change-Id: Ib3517c186da6e49574b873ac568afd0e8e4336c5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2143980Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#67102}

Port 445f9ef1

R=zhiguo.zhou@intel.com, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I3b383071ea26286e9d1d5121565020a0c6f31a91
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2147030Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#67101}

Port bd04ee08

R=fanchen.kong@intel.com, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I3b8e2625816a8517a0557882d6acdb6d6f28766b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2147029Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#67100}

Bug: v8:9909
Change-Id: I13d7ae7b304fe55645ef7bcc9ac404782bb55d4e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2131323Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Fanchen Kong <fanchen.kong@intel.com>
Cr-Commit-Position: refs/heads/master@{#67099}

Port bd04ee08
https://crrev.com/c/2143386

Change-Id: I547c9b5b341abe76d6983a07633129299c32e017
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2143978Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#67098}

Change-Id: Iaa39a9fd8ee0a80b04c5664328931383545e074b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144747Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#67097}

Bug: v8:9909
Change-Id: I21980ee97e0d2483c064e40cae181297b4d563a1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2107511
Commit-Queue: Zhiguo Zhou <zhiguo.zhou@intel.com>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67096}

Bug: v8:9909
Change-Id: I5dd3e88ab6f7508a07b2a8e5adb033fff7e28fe2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2143386Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Fanchen Kong <fanchen.kong@intel.com>
Cr-Commit-Position: refs/heads/master@{#67095}

Port 04b6e0de
https://crrev.com/c/2135074

Original Commit Message:

  This reorders the SIMD opcodes together with their implementations
  on x64, ia32 according to src/wasm/wasm-opcodes.h.

Change-Id: I82c8b678eb65b616d02d20333d479ee4ae0564d0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2143974Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#67094}

Port 1a7f5689

R=mlippautz@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I4db697c6a0fab9bd3c9dda4761c3af3ade509ffa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144691
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67093}

Port da409929

Original Commit Message:

    Adds:
    - GetStackStart
    - GetCurrentStackPosition
    - GetStackSlot which translates a stack slot through ASAN
      if needed

R=mlippautz@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: Icdf50db1c4d0b6ce3c9819cda4663dc640ec6f43
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144292Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#67092}

This relands commit df204288 with the
addtional fix to Haddps to enable SSE3 scope.

There are a couple more left in some i64x2 ops, but those are not in the
proposal, so I've left them as it is.

Bug: v8:9561
Change-Id: I88fd5f88809e629f53a65d67ea5b11562111b44a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2136067Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67091}

In production, the debug side tables will always be produced with
Liftoff in debug mode ({CompilationEnv::debug} being set).
Thus, this CL switches the tests to also test this configuration.

R=thibaudm@chromium.org

Bug: v8:10410
Change-Id: I3fa16f099d2bb612c7abf8c3ef518e1446564306
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144119Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67090}

Bug: v8:10407
Change-Id: I4fb6544ca575e115ed84c1e15911794f3fb4a627
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144112Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Richard Townsend <richard.townsend@arm.com>
Cr-Commit-Position: refs/heads/master@{#67089}

- Fix property name table with very long names
- List all keyboard shortcuts

Change-Id: I4eba14143a0cf71f4e8c02159a1f16113aa2600a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2142267Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67088}

This is a reland of f902ef32

Original change's description:
> [wasm] Cleanup wasm script creation
> 
> - Do not expose CreateWasmScript since we should now use
> WasmEngine:GetOrCreateScript instead,
> - Initialize all Script fields in CreateWasmScript, not in
> WasmModuleObject::New,
> - Do not pass code size estimate argument, since we can always use the
> actual native module's committed code space.
> 
> R=clemensb@chromium.org
> 
> Bug: v8:10349
> Change-Id: If9250d62ffc271ab6efc3b9c45958a305c9d1827
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2135633
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67083}

Bug: v8:10349
Change-Id: I38c8b6beb07a1e5d565c6a5fd749daea147817bb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144064Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67087}

Per the spec [1], a resolved promise may be “pending, fulfilled, or
rejected”, but previously V8 incorrectly used the term “resolved”
instead of “fulfilled”. This change is user-observable through the
`d8` REPL and the DevTools Console.

Corresponding DevTools CL:
https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2141673

Corresponding Chromium CL:
https://chromium-review.googlesource.com/c/chromium/src/+/2144095

[1]: https://tc39.es/ecma262/#sec-properties-of-promise-instances

Bug: v8:6751, v8:5416
Change-Id: I6c5302c280d01cf681c6358add3d2e88fbffa36f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144011
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67086}

This reverts commit f902ef32.

Reason for revert: Makes gc-stress unhappy: https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20gc%20stress/27404

Original change's description:
> [wasm] Cleanup wasm script creation
> 
> - Do not expose CreateWasmScript since we should now use
> WasmEngine:GetOrCreateScript instead,
> - Initialize all Script fields in CreateWasmScript, not in
> WasmModuleObject::New,
> - Do not pass code size estimate argument, since we can always use the
> actual native module's committed code space.
> 
> R=​clemensb@chromium.org
> 
> Bug: v8:10349
> Change-Id: If9250d62ffc271ab6efc3b9c45958a305c9d1827
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2135633
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67083}

TBR=clemensb@chromium.org,thibaudm@chromium.org

Change-Id: Iac2978af1a300ec079baebab0feb8c9598711738
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:10349
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144058Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67085}

This reverts commit 3e1c7040.

Reason for revert: https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20TSAN%20-%20concurrent%20marking/12665

Original change's description:
> Reland "cppgc: Add page memory allocation backend"
> 
> This is a port of src/components/gc that was added recently.
> 
> Differences:
> - Added back bucketing to the page pool, as that guarantees that
>   arenas used for specific types do not have their pages used by other
>   arenas.
> - Replaced base::flat_map with std::map. This may cause performance
>   regressions when using PageMemoryRegionTree in hot paths. A
>   vector-like representation may be used to fix such a regression
> 
> This reverts commit 656c68a7.
> 
> Bug: chromium:1056170
> Change-Id: I638183c944255ebcaab47d2b94b1980d54479746
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2143814
> Reviewed-by: Maya Lekova <mslekova@chromium.org>
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67080}

TBR=mlippautz@chromium.org,mslekova@chromium.org

Change-Id: I04b048dd979c32e9275c972307796d5f75865037
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1056170
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144114Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67084}

- Do not expose CreateWasmScript since we should now use
WasmEngine:GetOrCreateScript instead,
- Initialize all Script fields in CreateWasmScript, not in
WasmModuleObject::New,
- Do not pass code size estimate argument, since we can always use the
actual native module's committed code space.

R=clemensb@chromium.org

Bug: v8:10349
Change-Id: If9250d62ffc271ab6efc3b9c45958a305c9d1827
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2135633Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67083}

R=ahaas@chromium.org

Bug: v8:10408
Change-Id: I6a4a1d82333cf31520526c766357c78d3d8dd206
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2140941
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67082}

Templates provide better error messages and make debugging easier.

R=zhin@chromium.org

Bug: v8:10364
Change-Id: Ia3581c4458e8edb3b24371605000b0b00bb5069d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2140936
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67081}

This is a port of src/components/gc that was added recently.

Differences:
- Added back bucketing to the page pool, as that guarantees that
  arenas used for specific types do not have their pages used by other
  arenas.
- Replaced base::flat_map with std::map. This may cause performance
  regressions when using PageMemoryRegionTree in hot paths. A
  vector-like representation may be used to fix such a regression

This reverts commit 656c68a7.

Bug: chromium:1056170
Change-Id: I638183c944255ebcaab47d2b94b1980d54479746
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2143814Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67080}

GetHeapFromPayload returned the page header address instead of the
value of the first field of the header.

Bug: chromium:1056170
Change-Id: I4de5be975accced32460d6fab91543e6a5b07ba0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2143825
Auto-Submit: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67079}

This increases source code size, but the code is simple and repetitive.
Complexity is reduced by removing the macros.

R=zhin@chromium.org

Bug: v8:10364
Change-Id: I989c4d78aaebe00c7fbb525d88a6670cd0fe3b92
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2141732Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67078}

Fix off-thread space merging unit tests, by

  a) Doing a GC on each test teardown (avoiding leaking GC state between
     tests), and
  b) Removing the AllocationStep when merging, which could cause a
     deadlock if incremental marking triggered a free-list refill.

Bug: v8:10142
Change-Id: Id2670115f96ab3b13613ea357bd44a639d0151e1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2142260
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67077}

This CL provides a basic allocator that allocates normal-sized objects
on pages without ever reusing them. This allows for already using the
backref from page to heap which is used in some critical places
(pre-finalizers, write barrier, Persistent).

Bug: chromium:1056170
Change-Id: Ifada9b7e984827906c267d1a3a521576587feaeb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2141736
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67076}

Add flag FLAG_concurrent_allocation that when enabled protects all runtime allocations in the old space with a mutex. Prerequisite for concurrent allocation. Still disabled by default.

Bug: v8:10315
Change-Id: I37e59b3d51fe3aad112f0b556ea867cc0a2496e2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2140937
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67075}

This reverts commit d4056c61.

Reason for revert: Fails on GCC, please check https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20gcc/6184

Original change's description:
> cppgc: Add page memory allocation backend
> 
> This is a port of src/components/gc that was added recently.
> 
> Differences:
> - Added back bucketing to the page pool, as that guarantees that
>   arenas used for specific types do not have their pages used by other
>   arenas.
> - Replaced base::flat_map with std::map. This may cause performance
>   regressions when using PageMemoryRegionTree in hot paths. A
>   vector-like representation may be used to fix such a regression
> 
> Bug: chromium:1056170
> Change-Id: I03e3abe55faf7bb50c8011dafc23396889bf66db
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2139586
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Reviewed-by: Omer Katz <omerkatz@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Hannes Payer <hpayer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67073}

TBR=ulan@chromium.org,hpayer@chromium.org,mlippautz@chromium.org,bikineev@chromium.org,omerkatz@chromium.org

Change-Id: I1e421898bb8a08f32d8eb2355ed547e0ee38b429
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1056170
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2140949Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67074}

This is a port of src/components/gc that was added recently.

Differences:
- Added back bucketing to the page pool, as that guarantees that
  arenas used for specific types do not have their pages used by other
  arenas.
- Replaced base::flat_map with std::map. This may cause performance
  regressions when using PageMemoryRegionTree in hot paths. A
  vector-like representation may be used to fix such a regression

Bug: chromium:1056170
Change-Id: I03e3abe55faf7bb50c8011dafc23396889bf66db
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2139586
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67073}

While working on some AVX stuff, saw that these ops were missing from
the test cases.

Change-Id: Ie41be465a0715323096c6549b21aa9e994eaac3e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2137472Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67072}