BUG=v8:6261, v8:6278, v8:6344

Review-Url: https://codereview.chromium.org/2868343002
Cr-Commit-Position: refs/heads/master@{#45236}

BUG=chromium:651354

Review-Url: https://codereview.chromium.org/2872063003
Cr-Commit-Position: refs/heads/master@{#45235}

Since the feedback vector is itself a native context structure, why
not store optimized code for a function in there rather than in
a map from native context to code? This allows us to get rid of
the optimized code map in the SharedFunctionInfo, saving a pointer,
and making lookup of any optimized code quicker.

Original patch by Michael Stanton <mvstanton@chromium.org>

BUG=v8:6246,chromium:718891
TBR=yangguo@chromium.org,ulan@chromium.org

Change-Id: I3bb9ec0cfff32e667cca0e1403f964f33a6958a6
Reviewed-on: https://chromium-review.googlesource.com/500134Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45234}

R=clemensh@chromium.org

Change-Id: Id3a44a247bc881ba0f9d41a242cbb6130094771c
Reviewed-on: https://chromium-review.googlesource.com/501847
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45233}

[turbofan] [builtins] Unify construct builtins for JS functions and classes and add inlining and deoptimizer support

BUG=v8:6180
R=mstarzinger@chromium.org

Change-Id: Iac5782a0f6b0ff92293421656d907073cfc3f5dd
Reviewed-on: https://chromium-review.googlesource.com/489525
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45232}

When black allocation is turned on at deserialization time, then
slots in deserialized objects have to be visited by the incremental
marker. For spaces with reservations, this has always been done; for
large object space with its special handling, this patch adds it.

Additionally, we must ensure that no incremental steps that might
cause incremental marking to finish are performed while there is an
AlwaysAllocateScope around.

BUG=chromium:718859

Review-Url: https://codereview.chromium.org/2868103002
Cr-Commit-Position: refs/heads/master@{#45231}

BUG=chromium:694255

Review-Url: https://codereview.chromium.org/2872263002
Cr-Commit-Position: refs/heads/master@{#45230}

This reverts commit 8f89e286.

Review-Url: https://codereview.chromium.org/2876503002
Cr-Commit-Position: refs/heads/master@{#45229}

BUG=v8:6380

Review-Url: https://codereview.chromium.org/2872173003
Cr-Commit-Position: refs/heads/master@{#45228}

Revert of [heap] Verify remembered set for objects in the old generation. (patchset #3 id:40001 of https://codereview.chromium.org/2868053002/ )

Reason for revert:
buildbot failures

Original issue's description:
> [heap] Verify remembered set for objects in the old generation.
>
> Review-Url: https://codereview.chromium.org/2868053002
> Cr-Commit-Position: refs/heads/master@{#45225}
> Committed: https://chromium.googlesource.com/v8/v8/+/755a809ee5f91f5f63d5f056af37090960be002c

TBR=mlippautz@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2870413002
Cr-Commit-Position: refs/heads/master@{#45227}

Added support for DINSM and DINSU bit insertion instructions. Also fixed
errors with bit extraction instructions, added disassembler tests and
adjusted the code to make it more compact.

BUG=
TEST=cctest/test-assembler-mips/Dins
     cctest/test-disasm-mips/Type0

Review-Url: https://codereview.chromium.org/2871663002
Cr-Commit-Position: refs/heads/master@{#45226}

Review-Url: https://codereview.chromium.org/2868053002
Cr-Commit-Position: refs/heads/master@{#45225}

This ports:
https://chromium-review.googlesource.com/c/493466/

The code was originally copied from bot_update. So were the bugs.

Bug: chromium:717504
NOTRY=true
TBR=tandrii@chromium.org,agable@chromium.org

Change-Id: If2d2dafdca8cd44f325dc770dfc42c17889a3b4a
Reviewed-on: https://chromium-review.googlesource.com/501787Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45224}

BUG=chromium:651354

Review-Url: https://codereview.chromium.org/2855143003
Cr-Commit-Position: refs/heads/master@{#45223}

One of the serializer fuzzers passes in random data to the deserializer,
which can then be used to deserialize a JSRegExp instance with random flag
contents. This can cause issues since the JSRegExp::Flag enum statically
contains kDotAll - but it is only valid to set kDotAll iff
FLAG_harmony_regexp_dotall is set.

This CL verifies deserialized flags before constructing the JSRegExp
and bails out if they are invalid.

R=jbroman@chromium.org,yangguo@chromium.org
BUG=chromium:719280

Review-Url: https://codereview.chromium.org/2870743004
Cr-Commit-Position: refs/heads/master@{#45222}

This fixes cases where falling off the end of a non-void function was
accepted as a valid asm.js module. This led to translation failures in
the WASM code. Only void functions are allowed to fall off the end.

R=clemensh@chromium.org
TEST=mjsunit/asm/return-types
BUG=chromium:719286

Change-Id: I7b1c9ba5381b87a23cf0a2171bee5e5f5e8cd9de
Reviewed-on: https://chromium-review.googlesource.com/500312
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45221}

By C++ standard, behaviour is undedined when converting -Infinity to
integer. This patch assures correct behaviour in this case on all
platforms.

BUG=

Review-Url: https://codereview.chromium.org/2865113005
Cr-Commit-Position: refs/heads/master@{#45220}

Mechanical change to remove argument adaption from RegExp.p.split,
RegExp.p.replace when the actual arguments counts does not match
the formal parameter count (should be a tad faster this way).

BUG=v8:6369

Review-Url: https://codereview.chromium.org/2865313002
Cr-Commit-Position: refs/heads/master@{#45219}

Mechanical change to remove argument adaption from Array.p.indexOf and
Array.p.includes when the actual arguments counts does not match the formal
parameter count.

BUG=v8:6369

Review-Url: https://codereview.chromium.org/2873653002
Cr-Commit-Position: refs/heads/master@{#45218}

Isolate::ThrowException calls Debug::OnException, this method can potentially enter debugger context and on exception inspector can lazily compile injected-script-source so NO_SCRIPT_NO_EXCEPTIONS restriction looks too strict to me

R=jochen@chromium.org
BUG=v8:5830

Change-Id: Ic37aaa7bc6f2bd5922654f1a3c235d5eaacb8f85
Reviewed-on: https://chromium-review.googlesource.com/501351
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45217}

For small arrays, it's way faster to just move the elements instead of
doing the fairly complex and heavy-weight left-trimming. Crankshaft has
had this optimization for small arrays already; this CL more or less
ports this functionality to TurboFan, which yields a 4x speed-up when
using shift on small arrays (with up to 16 elements).

This should recover some of the regressions reported in the Node.js issues

  https://github.com/nodejs/node/issues/12657

and discovered for the syncthrough module using

  https://github.com/mcollina/syncthrough/blob/master/benchmarks/basic.js

as benchmark.

R=jarin@chromium.org
BUG=v8:6376

Review-Url: https://codereview.chromium.org/2874453002
Cr-Commit-Position: refs/heads/master@{#45216}

This reverts commit 45bbf804.

Reason for revert: Still some flakes.

Original change's description:
> Reland "Introducing an event loop mechanism for d8."
> 
> This reverts commit 02595c60.
> 
> Original CL: https://chromium-review.googlesource.com/c/494968/
> 
> Bug: 
> Change-Id: I7441ed91ebb4a087cdf437ae3239f9b021110a11
> Reviewed-on: https://chromium-review.googlesource.com/500947
> Reviewed-by: Bill Budge <bbudge@chromium.org>
> Commit-Queue: Mircea Trofin <mtrofin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#45212}

TBR=bradnelson@chromium.org,bbudge@chromium.org,mtrofin@chromium.org,jochen@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Bug: 
Change-Id: Idf2ea0431865104042a68bd2dac944a9725bf3f9
Reviewed-on: https://chromium-review.googlesource.com/501370Reviewed-by: Mircea Trofin <mtrofin@chromium.org>
Commit-Queue: Mircea Trofin <mtrofin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45215}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/db1fe5b..5a162d8

Rolling v8/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+log/a263e55..0e86ab1

TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org

Change-Id: Ibe00f33fbdde392d015f9b825eb4e0ba64370fc6
Reviewed-on: https://chromium-review.googlesource.com/501212Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45214}

During i18n code reorg, a couple of changes for ICU 59 prep were
lost. Add them back.

See https://codereview.chromium.org/2738503008/ for the original CL.

BUG=v8:6062
TEST=v8 can be compiled with ICU 59 (hash: c28886684 ).

Change-Id: Ie19a40a9e54d0a8966dbe8e072f9afabf9e85e4f
Reviewed-on: https://chromium-review.googlesource.com/499609Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Jungshik Shin <jshin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45213}

This reverts commit 02595c60.

Original CL: https://chromium-review.googlesource.com/c/494968/

Bug: 
Change-Id: I7441ed91ebb4a087cdf437ae3239f9b021110a11
Reviewed-on: https://chromium-review.googlesource.com/500947Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Mircea Trofin <mtrofin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45212}

This CL introduces a new type, MapHandles, which is a STL vector of Handle<Map>.
It is now used everywhere where lists of Handle<Maps> are required, replacing
usages of V8's internal List type.

Also-By: franzih@chromium.org
BUG=v8:6333,v8:6325
LOG=N

Review-Url: https://codereview.chromium.org/2809923002
Cr-Commit-Position: refs/heads/master@{#45211}

- S32x4Shuffle by decomposing into s-register moves if no patterns match.
- S16x8Shuffle, S8x16Shuffle implemented with vtbl if no patterns match.

LOG=N
BUG=v8:6020

Review-Url: https://codereview.chromium.org/2856363003
Cr-Commit-Position: refs/heads/master@{#45210}

This reverts commit 266ff756.

Reason for revert: Gerrit went ahead and committed my CL before I had a chance to upload the fix. 

Original change's description:
> Revert "Revert "Revert "Introducing an event loop mechanism for d8."""
> 
> This reverts commit 7dcc8eff.
> 
> Reason for revert: Fixed: when running under --verify-predictable,
> because the PredictablePlatform runs either foreground and background
> tasks immediately, we don't need to support event looping.
> 
> Original change's description:
> > Revert "Revert "Introducing an event loop mechanism for d8.""
> > 
> > This reverts commit f7c25da6.
> > 
> > Reason for revert: Fixed
> > 
> > Original change's description:
> > > Revert "Introducing an event loop mechanism for d8."
> > > 
> > > This reverts commit de964dbe.
> > > 
> > > Reason for revert:
> > > https://build.chromium.org/p/client.v8/builders/V8%20Linux/builds/17958
> > > 
> > > Original change's description:
> > > > Introducing an event loop mechanism for d8.
> > > > 
> > > > This mechanism ensures APIs like wasm async complete their work, 
> > > > without requiring use of natives (%APIs).
> > > > 
> > > > The mechanism is similar to the one used in content_shell,
> > > > which should allow us to easily port tests in that environment.
> > > > 
> > > > Review-Url: https://codereview.chromium.org/2842843005
> > > > Cr-Original-Commit-Position: refs/heads/master@{#44908}
> > > > Bug: 
> > > > Change-Id: I9deee0d256a600c60b42902fc8ef8478e5546344
> > > > Reviewed-on: https://chromium-review.googlesource.com/494968
> > > > Commit-Queue: Mircea Trofin <mtrofin@google.com>
> > > > Reviewed-by: Jochen Eisinger <jochen@chromium.org>
> > > > Cr-Commit-Position: refs/heads/master@{#45165}
> > > 
> > > TBR=bradnelson@chromium.org,mtrofin@chromium.org,mtrofin@google.com,jochen@chromium.org
> > > NOPRESUBMIT=true
> > > NOTREECHECKS=true
> > > NOTRY=true
> > > 
> > > Change-Id: Iafec2615d705d1990c57229cab3a988c00b5e12f
> > > Reviewed-on: https://chromium-review.googlesource.com/498630
> > > Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> > > Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#45166}
> > 
> > TBR=bradnelson@chromium.org,machenbach@chromium.org,mtrofin@chromium.org,mtrofin@google.com,jochen@chromium.org,v8-reviews@googlegroups.com
> > NOPRESUBMIT=true
> > NOTREECHECKS=true
> > NOTRY=true
> > 
> > Change-Id: Ic3c782e918326e291a6cb9bb349c609e9a340b09
> > Reviewed-on: https://chromium-review.googlesource.com/498430
> > Reviewed-by: Mircea Trofin <mtrofin@chromium.org>
> > Commit-Queue: Mircea Trofin <mtrofin@google.com>
> > Cr-Commit-Position: refs/heads/master@{#45172}
> 
> TBR=bradnelson@chromium.org,machenbach@chromium.org,mtrofin@chromium.org,mtrofin@google.com,jochen@chromium.org,v8-reviews@googlegroups.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> 
> Change-Id: If3036b3d4c89a88df3976924f11be88bfc5a6aa8
> Reviewed-on: https://chromium-review.googlesource.com/500867
> Reviewed-by: Mircea Trofin <mtrofin@chromium.org>
> Commit-Queue: Mircea Trofin <mtrofin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#45207}

TBR=bradnelson@chromium.org,machenbach@chromium.org,mtrofin@chromium.org,mtrofin@google.com,jochen@chromium.org,v8-reviews@googlegroups.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I4ccf312bebd8c3451a749457a123d0e4f48a666b
Reviewed-on: https://chromium-review.googlesource.com/500868Reviewed-by: Mircea Trofin <mtrofin@chromium.org>
Commit-Queue: Mircea Trofin <mtrofin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45209}

BUG=

Review-Url: https://codereview.chromium.org/2838943002
Cr-Commit-Position: refs/heads/master@{#45208}

This reverts commit 7dcc8eff.

Reason for revert: Fixed: when running under --verify-predictable,
because the PredictablePlatform runs either foreground and background
tasks immediately, we don't need to support event looping.

Original change's description:
> Revert "Revert "Introducing an event loop mechanism for d8.""
> 
> This reverts commit f7c25da6.
> 
> Reason for revert: Fixed
> 
> Original change's description:
> > Revert "Introducing an event loop mechanism for d8."
> > 
> > This reverts commit de964dbe.
> > 
> > Reason for revert:
> > https://build.chromium.org/p/client.v8/builders/V8%20Linux/builds/17958
> > 
> > Original change's description:
> > > Introducing an event loop mechanism for d8.
> > > 
> > > This mechanism ensures APIs like wasm async complete their work, 
> > > without requiring use of natives (%APIs).
> > > 
> > > The mechanism is similar to the one used in content_shell,
> > > which should allow us to easily port tests in that environment.
> > > 
> > > Review-Url: https://codereview.chromium.org/2842843005
> > > Cr-Original-Commit-Position: refs/heads/master@{#44908}
> > > Bug: 
> > > Change-Id: I9deee0d256a600c60b42902fc8ef8478e5546344
> > > Reviewed-on: https://chromium-review.googlesource.com/494968
> > > Commit-Queue: Mircea Trofin <mtrofin@google.com>
> > > Reviewed-by: Jochen Eisinger <jochen@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#45165}
> > 
> > TBR=bradnelson@chromium.org,mtrofin@chromium.org,mtrofin@google.com,jochen@chromium.org
> > NOPRESUBMIT=true
> > NOTREECHECKS=true
> > NOTRY=true
> > 
> > Change-Id: Iafec2615d705d1990c57229cab3a988c00b5e12f
> > Reviewed-on: https://chromium-review.googlesource.com/498630
> > Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> > Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#45166}
> 
> TBR=bradnelson@chromium.org,machenbach@chromium.org,mtrofin@chromium.org,mtrofin@google.com,jochen@chromium.org,v8-reviews@googlegroups.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> 
> Change-Id: Ic3c782e918326e291a6cb9bb349c609e9a340b09
> Reviewed-on: https://chromium-review.googlesource.com/498430
> Reviewed-by: Mircea Trofin <mtrofin@chromium.org>
> Commit-Queue: Mircea Trofin <mtrofin@google.com>
> Cr-Commit-Position: refs/heads/master@{#45172}

TBR=bradnelson@chromium.org,machenbach@chromium.org,mtrofin@chromium.org,mtrofin@google.com,jochen@chromium.org,v8-reviews@googlegroups.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: If3036b3d4c89a88df3976924f11be88bfc5a6aa8
Reviewed-on: https://chromium-review.googlesource.com/500867Reviewed-by: Mircea Trofin <mtrofin@chromium.org>
Commit-Queue: Mircea Trofin <mtrofin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45207}

This reverts commit 26fdb617.

Reason for revert: v8:6378

Original change's description:
> [stubs] Properly convert the receiver for GetPropertyStub.
> 
> Call ToObject on the GetPropertyStub input first, so that lookups on
> Strings and other primitives don't automatically hit the runtime, i.e.
> as the stub is also used to lookup the special @@split and @@replace
> symbols for various String builtins.
> 
> BUG=v8:5269
> R=​ishell@chromium.org
> 
> Change-Id: I5dbbc84aa2051173bf10be71c782fbe448481034
> Reviewed-on: https://chromium-review.googlesource.com/488441
> Commit-Queue: Igor Sheludko <ishell@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#44961}

TBR=ishell@chromium.org,bmeurer@chromium.org
# Not skipping CQ checks because original CL landed > 1 day ago.
BUG=v8:5269

Change-Id: I1e2e83b492d82656ead81ea35adbbcf5d324d2b8
Reviewed-on: https://chromium-review.googlesource.com/500135Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45206}

Bug: v8:6351
Change-Id: I6a5b44486bac87e2b3cb9aa93808b2c7964d6202
Reviewed-on: https://chromium-review.googlesource.com/499508
Commit-Queue: Adam Klein <adamk@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45205}

BUG=v8:6377

Change-Id: I5bdd41bdda83d7efe4b37d24d44e2e8c2339a30a
Reviewed-on: https://chromium-review.googlesource.com/500168
Commit-Queue: Wiktor Garbacz <wiktorg@google.com>
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45204}

Revert of [turbofan] Add alignment parameter to StackSlot operator (patchset #7 id:120001 of https://codereview.chromium.org/2816743003/ )

Reason for revert:
Seems to break cfi:
https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20-%20cfi/builds/9989

Original issue's description:
> [turbofan] Add alignment parameter to StackSlot operator
>
> If alignment parameter is set, the memory returned by the
> StackSlot operator will be aligned according to the parameter.
>
> The implementation goes like this. If alignment parameter is set
> we allocate a bit more memory than actually needed and so we
> can move the beginning of the StackSlot in order to have it aligned.
>
>
> BUG=
>
> Review-Url: https://codereview.chromium.org/2816743003
> Cr-Commit-Position: refs/heads/master@{#45197}
> Committed: https://chromium.googlesource.com/v8/v8/+/d8bfdb7a998adadc56aa5705a5998e75ceae7675

TBR=ahaas@chromium.org,clemensh@chromium.org,titzer@chromium.org,bmeurer@chromium.org,ivica.bogosavljevic@imgtec.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review-Url: https://codereview.chromium.org/2867403002
Cr-Commit-Position: refs/heads/master@{#45203}

heap_find walks all the page of the heap and finds the references to a given
address.

NOTRY=true

Change-Id: I3271ab96d0224acf2361fe5bc4c8b0a608caf091
Reviewed-on: https://chromium-review.googlesource.com/500190
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45202}

This extension imitates user-interaction on a page by randomly clicking on
links matching a given regexp pattern.

Change-Id: I210bebf36ce6e3a3c785953010ce21528093d1af
NOTRY=true

Change-Id: I210bebf36ce6e3a3c785953010ce21528093d1af
Reviewed-on: https://chromium-review.googlesource.com/500247
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45201}

We can inline the allocation of the generator object as long as our
closure is constant.

BUG=v8:6352

Review-Url: https://codereview.chromium.org/2867603002
Cr-Commit-Position: refs/heads/master@{#45200}

Bug: 
Change-Id: I41442b9608b791d695dcb6324158bec994f34cee
Reviewed-on: https://chromium-review.googlesource.com/500310Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45199}

Creation stack trace points to the place where callback was actually chained, scheduled points where parent promise was resolved.
For async tasks without creation stack (e.g. setTimeout) we continue to use scheduled as creation since usually they are the same.

BUG=v8:6189
R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2868493002
Cr-Commit-Position: refs/heads/master@{#45198}

If alignment parameter is set, the memory returned by the
StackSlot operator will be aligned according to the parameter.

The implementation goes like this. If alignment parameter is set
we allocate a bit more memory than actually needed and so we
can move the beginning of the StackSlot in order to have it aligned.

BUG=

Review-Url: https://codereview.chromium.org/2816743003
Cr-Commit-Position: refs/heads/master@{#45197}