port ff19726d (r35818)

  original commit message:
  Refactor the TurboFan pipeline to allow for concurrent recompilation in
  the same way that Crankshaft does it. For now we limit the concurrent
  phases to scheduling, instruction selection, register allocation and
  jump threading.

BUG=

Review-Url: https://codereview.chromium.org/1926383002
Cr-Commit-Position: refs/heads/master@{#35888}

Rolling v8/tools/clang to e18fbfd9a57db60c8667acfc60f5296337c7f4ab

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

Review-Url: https://codereview.chromium.org/1925193003
Cr-Commit-Position: refs/heads/master@{#35887}

Revert of Remove more dead code after Object.observe removal (patchset #5 id:80001 of https://codereview.chromium.org/1904313004/ )

Reason for revert:
[Sheriff] Looks like this breaks layout tests:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/6442

Original issue's description:
> Remove more dead code after Object.observe removal
>
> This moves __{define,lookup}{Getter,Setter}__ to builtins.cc to free up the JavaScript implementation of DefineOwnProperty for deletion.

TBR=verwaest@chromium.org,jkummerow@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/1929293002
Cr-Commit-Position: refs/heads/master@{#35886}

These checks ensure that a TypeError is thrown, per spec, rather than
a runtime assert failure.

BUG=v8:4964
R=adamk
LOG=Y

Review-Url: https://codereview.chromium.org/1929123002
Cr-Commit-Position: refs/heads/master@{#35885}

Review-Url: https://codereview.chromium.org/1919223003
Cr-Commit-Position: refs/heads/master@{#35884}

Do not hold bare pointers to scripts during sampling heap tree construction,
as string conversions may lead to an allocation that in turn could cause GC
which renders all pointers invalid.

Review-Url: https://codereview.chromium.org/1929813002
Cr-Commit-Position: refs/heads/master@{#35883}

Fixes 4 compile errors on Mac due to specifiers not matching type casts.

LOG=N
BUG=

Review-Url: https://codereview.chromium.org/1921483004
Cr-Commit-Position: refs/heads/master@{#35882}

Also revert "[heap] Force inlining of AllocatedSinceLastGC"

This is a speculative revert to see if it actually impacts the benchmarks in
question.

This reverts commit 723e120b.
This reverts commit 08dbdd40.

BUG=chromium:605524
LOG=N
TBR=ulan@chromium.org

Review-Url: https://codereview.chromium.org/1932883002
Cr-Commit-Position: refs/heads/master@{#35881}

This could be the case when running nested message loop
while paused in debugger.

BUG=none
LOG=N

Review-Url: https://codereview.chromium.org/1922703005
Cr-Commit-Position: refs/heads/master@{#35880}

This refines 6382a610 -- as we still
require clean up of the uint index register.

TEST=mjsunit/asm/float32array-negative-offset
R=joransiu@ca.ibm.com, mbrandy@us.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Conflicts:
	src/compiler/s390/code-generator-s390.cc

Review-Url: https://codereview.chromium.org/1921073003
Cr-Commit-Position: refs/heads/master@{#35879}

Port 306c412c

Original commit message:

    This is needed by Blink to implement the Custom Elements spec.

R=adamk@chromium.org, joransiu@ca.ibm.com, bjaideep@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:4261
LOG=N

Review-Url: https://codereview.chromium.org/1925233002
Cr-Commit-Position: refs/heads/master@{#35878}

Try catch interacts badly with OSR and for-in.

BUG=chromium:607493
LOG=n

Review-Url: https://codereview.chromium.org/1931973002
Cr-Commit-Position: refs/heads/master@{#35877}

This moves __{define,lookup}{Getter,Setter}__ to builtins.cc to free up the JavaScript implementation of DefineOwnProperty for deletion.

Review-Url: https://codereview.chromium.org/1904313004
Cr-Commit-Position: refs/heads/master@{#35876}

I introduced a new flag, --wasm-parallel-compilation, which turns on
parallel compilation of wasm modules. If parallel compilation is turned
on, then the compilation of wasm functions is split into three phases,
initialization, execution, and finalization. The execution phase is the
phase which is going to contain all the code that can be executed in
parallel. At the moment the execution phase is still empty.

R=titzer@chromium.org

Review-Url: https://codereview.chromium.org/1928933002
Cr-Commit-Position: refs/heads/master@{#35875}

Port 9bf7a31a

 Original commit message:

        Default (and only way) is now to retrieve a tagged object.

R=joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com

BUG=

Review-Url: https://codereview.chromium.org/1929673002
Cr-Commit-Position: refs/heads/master@{#35874}

Implement unaligned access instructions, and tests for corresponding
instruction

BUG=

Review-Url: https://codereview.chromium.org/1902743002
Cr-Commit-Position: refs/heads/master@{#35873}

Instead of replacing the array with an empty one after resuming, overwrite
contents with a new Oddball.

This will simplify the work to be done by the bytecode graphbuilder and
potentially allow for more optimization.

(For full-codegen generators, nothing changes.)

BUG=v8:4907
LOG=n

Review-Url: https://codereview.chromium.org/1923253002
Cr-Commit-Position: refs/heads/master@{#35872}

Revert of [Ignition] Test ignition on all bots. (patchset #4 id:60001 of https://codereview.chromium.org/1804003002/ )

Reason for revert:
Will resubmit with proper fix and more test skips.

Original issue's description:
> [Ignition] Test ignition on all bots.
>
> This adds ignition to the testing variants that are run on all
> bots.
>
> Failing tests can only be skipped with the NO_IGNITION
> keyword in status files. Existing expectations for the
> ignition_turbofan variant are all duplicated and use the
> NO_IGNITION keyword as well now.
>
> BUG=v8:4280
> LOG=N
> NOTRY=true

TBR=rmcilroy@chromium.org,mstarzinger@chromium.org,yangguo@chromium.org,mythria@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4280

Review-Url: https://codereview.chromium.org/1930943002
Cr-Commit-Position: refs/heads/master@{#35871}

R=vogelheim@chromium.org

Review-Url: https://codereview.chromium.org/1928943002
Cr-Commit-Position: refs/heads/master@{#35870}

Speculatively forcining inlining as not inlining potentially regresses
performance.

BUG=chromium:605524
LOG=N

Review-Url: https://codereview.chromium.org/1924033003
Cr-Commit-Position: refs/heads/master@{#35869}

R=hablich@chromium.org
BUG=v8:4942
LOG=true

Review-Url: https://codereview.chromium.org/1928513004
Cr-Commit-Position: refs/heads/master@{#35868}

-Wno-undefined-var-template flag is unknown by Xcode's clang. And it is
better to use the same clang version that is used on linux.

BUG=

Review-Url: https://codereview.chromium.org/1926633004
Cr-Commit-Position: refs/heads/master@{#35867}

R=aizatsky@chromium.org, jochen@chromium.org, kcc@chromium.org, ochang@chromium.org
BUG=584819
LOG=Y

Review-Url: https://codereview.chromium.org/1927933002
Cr-Commit-Position: refs/heads/master@{#35866}

This adds ignition to the testing variants that are run on all
bots.

Failing tests can only be skipped with the NO_IGNITION
keyword in status files. Existing expectations for the
ignition_turbofan variant are all duplicated and use the
NO_IGNITION keyword as well now.

BUG=v8:4280
LOG=N
NOTRY=true

Review-Url: https://codereview.chromium.org/1804003002
Cr-Commit-Position: refs/heads/master@{#35865}

DevTools uses the debug interrupt to trap on function entry. Without
source position at the stack check, we would get bogus source positions.

R=mstarzinger@chromium.org
BUG=chromium:595646
LOG=N

Review-Url: https://codereview.chromium.org/1925063002
Cr-Commit-Position: refs/heads/master@{#35864}

Revert of [turbofan] Run everything after representation selection concurrently. (patchset #2 id:20001 of https://codereview.chromium.org/1926023002/ )

Reason for revert:
[Sheriff] Flaky crashed here and there:
https://build.chromium.org/p/client.v8/builders/V8%20Linux/builds/9867
https://build.chromium.org/p/client.v8/builders/V8%20Linux64/builds/9589
https://build.chromium.org/p/client.v8/builders/V8%20Mac/builds/7679

Original issue's description:
> [turbofan] Run everything after representation selection concurrently.
>
> Further refactor the pipeline to even run the first scheduler (part of
> the effect control linearization) concurrently. This temporarily
> disables most of the write barrier elimination, but we will get back to
> that later.

TBR=mstarzinger@chromium.org,bmeurer@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/1925073002
Cr-Commit-Position: refs/heads/master@{#35863}

- Move the check from the BytecodeArrayBuilder destructor, which doesn't get
  called, to the ToBytecodeArray function.
- Remove the now empty destructor.
- For generators, bind unused resume point labels somewhere.

R=rmcilroy@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/1924093005
Cr-Commit-Position: refs/heads/master@{#35862}

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Review-Url: https://codereview.chromium.org/1926023002
Cr-Commit-Position: refs/heads/master@{#35861}

BUG=chromium:606898
LOG=n

Review-Url: https://codereview.chromium.org/1932703002
Cr-Commit-Position: refs/heads/master@{#35860}

We effectively have 4 different cases to deal with, including the default, but on some platform where we emit the jump table inline (e.g. arm64) we end up emitting an unconditional jump to the same address 127 times.

BUG=

Review-Url: https://codereview.chromium.org/1765883002
Cr-Commit-Position: refs/heads/master@{#35859}

R=machenbach@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/1927083002
Cr-Commit-Position: refs/heads/master@{#35858}

BUG=v8:4947
LOG=Y

Review-Url: https://codereview.chromium.org/1919673006
Cr-Commit-Position: refs/heads/master@{#35857}

R=machenbach@chromium.org
BUG=v8:4690
LOG=N

Review-Url: https://codereview.chromium.org/1925993002
Cr-Commit-Position: refs/heads/master@{#35856}

BUG=chromium:607115
LOG=n

Review-Url: https://codereview.chromium.org/1928903002
Cr-Commit-Position: refs/heads/master@{#35855}

TEST=mjsunit/asm/embenchen/zlib
BUG=

Review-Url: https://codereview.chromium.org/1925543003
Cr-Commit-Position: refs/heads/master@{#35854}

R=ulan@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/1918403003
Cr-Commit-Position: refs/heads/master@{#35853}

Flat cons-strings point directly to the internalized version of the string. This makes reinternalization much faster.

BUG=

Review-Url: https://codereview.chromium.org/1932663002
Cr-Commit-Position: refs/heads/master@{#35852}

Revert of [ignition] Inline the binary op TurboFan code stubs in the bytecode handlers. (patchset #4 id:60001 of https://codereview.chromium.org/1902823002/ )

Reason for revert:
Caused a performance regression in TurboFan and did not improve in a significant way Ignition's performances.

Original issue's description:
> [ignition] Inline the binary op TurboFan code stubs in the bytecode handlers.
>
> Adds a Generate method to the stubs that can be used to embed the graph directly in the bytecode handlers.
>
> Committed: https://crrev.com/e8caf78ff2a9f7d50ac9b47f6b4c80f92b69914a
> Cr-Commit-Position: refs/heads/master@{#35696}

TBR=bmeurer@chromium.org,rmcilroy@chromium.org,machenbach@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.

Review-Url: https://codereview.chromium.org/1927873002
Cr-Commit-Position: refs/heads/master@{#35851}

This fixes a bug where the iterable's .return method gets called when it
shouldn't.

R=littledan@chromium.org
BUG=v8:4952
LOG=n

Review-Url: https://codereview.chromium.org/1927073002
Cr-Commit-Position: refs/heads/master@{#35850}

NOTRY=true
TBR=machenbach@chromium.org
BUG=v8:4961
LOG=N

Review-Url: https://codereview.chromium.org/1928893002
Cr-Commit-Position: refs/heads/master@{#35849}