This extends the stack unwinding logic to respect optimized frames
and perform a lookup in the handler table to find handlers. It also
contains fixes to the API call stubs to allow a stack walk while
promoting scheduled exceptions.

R=jarin@chromium.org
TEST=cctest/test-run-jsexceptions

Review URL: https://codereview.chromium.org/969533004

Cr-Commit-Position: refs/heads/master@{#27016}

BUG=

Review URL: https://codereview.chromium.org/980843002

Cr-Commit-Position: refs/heads/master@{#27015}

R=dslomov@chromium.org, mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/976053002

Cr-Commit-Position: refs/heads/master@{#27014}

BUG=v8:3929
LOG=y

Review URL: https://codereview.chromium.org/980613002

Cr-Commit-Position: refs/heads/master@{#27013}

Revert of rename UniquePersistent to Global (patchset #2 id:20001 of https://codereview.chromium.org/980173003/)

Reason for revert:
breaks arm compile

Original issue's description:
> rename UniquePersistent to Global
>
> BUG=
>
> Committed: https://crrev.com/3f5ae16c62b031ad572f750d81ffc71c5d6d1f9b
> Cr-Commit-Position: refs/heads/master@{#27011}

TBR=svenpanne@chromium.org,dcarney@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/983653002

Cr-Commit-Position: refs/heads/master@{#27012}

BUG=

Review URL: https://codereview.chromium.org/980173003

Cr-Commit-Position: refs/heads/master@{#27011}

This way, every function in those lists has one C++ implementation
called Runtime_##name. The previous distinction was confusing.

Review URL: https://codereview.chromium.org/983623002

Cr-Commit-Position: refs/heads/master@{#27010}

Before this change, out of two versions 4.2.13.1 and
4.2.14, the latter would have been considered the newest.
Now, the timestamp of the commit determines the age, which
allows to roll a patched version first. The auto-roller
will only roll forward (i.e. there needs to be a commit
range between the last roll and the new candidate).

Additionally, this CL does some cleanups:
- Use the sheriff detection mechanism in the auto-roller.
- Require the roll revision parameter in the chromium_roll
script to avoid redundancy. The auto_roll script determines
that revision automatically.
- Simplify the revision summary in the commit message. The
summary will now show last_roll..new_roll, which e.g.
includes the version change CL. It'll now show useful
information for cherry-picks, which it didn't before.
- Remove unused clusterfuzz check. That check is part of the
release process script.

TBR=tandrii@chromium.org
NOTRY=true
TEST=./script_test.py
TEST=./tools/release/chromium_roll.py --dry-run --sheriff -c ~/tmp/chromium/src --last-roll 55b9049ea3978a589d8db2aa191d21222eef737f fc263505535a175c8efa18f4c787bd92a1d1ab3d --use-commit-queue -r me -a you

Review URL: https://codereview.chromium.org/977903002

Cr-Commit-Position: refs/heads/master@{#27009}

BUG=
LOG=n
TBR=yurys, svenpanne

Review URL: https://codereview.chromium.org/978203002

Cr-Commit-Position: refs/heads/master@{#27008}

TBR=dcarney@chromium.org

Review URL: https://codereview.chromium.org/980163002

Cr-Commit-Position: refs/heads/master@{#27007}

This adds support for the double bits intrinsics to TurboFan, and is
a first step towards fast Math functions inlined into TurboFan code
or even compiled by themselves with TurboFan.

Review URL: https://codereview.chromium.org/974313002

Cr-Commit-Position: refs/heads/master@{#27006}

This was fixed by 064be238 and will no longer fail, even on the
no-snap ARM64 simulator.

R=bmeurer@chromium.org
TEST=cctest/test-run-jsexceptions/DeoptFinallyReturn

Review URL: https://codereview.chromium.org/979823002

Cr-Commit-Position: refs/heads/master@{#27005}

BUG=v8:3669
LOG=Y

Review URL: https://codereview.chromium.org/978783002

Cr-Commit-Position: refs/heads/master@{#27004}

port 1a608493 (r26983)

original commit message:

   Refactor BreakLocationIterator.

   We now have BreakLocation::Iterator to iterate via RelocIterator, and
   create a BreakLocation when we are done iterating. The reloc info is
   stored in BreakLocation in a GC-safe way and instantiated on demand.

BUG=

Review URL: https://codereview.chromium.org/978183002

Cr-Commit-Position: refs/heads/master@{#27003}

Rolling v8/build/gyp to 4a9b712d5cb4a5ba7a9950128a7219569caf7263

Rolling v8/buildtools to d4dd4f79f60bf019625b3a1436979b0a42c892df

Rolling v8/tools/clang to 5309ba9a6f1e56592860a623db451aef00ae941d

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/978193002

Cr-Commit-Position: refs/heads/master@{#27002}

port 1604bd46 (r26972).

original commit message:

   Implement subclassing Arrays.

BUG=

Review URL: https://codereview.chromium.org/969943003

Cr-Commit-Position: refs/heads/master@{#27001}

port 4acbc93d (r26957)

original commit message:

   Move stack unwinding logic into the runtime.

BUG=

Review URL: https://codereview.chromium.org/977013002

Cr-Commit-Position: refs/heads/master@{#27000}

Rolling v8/third_party/icu to eda9e75b1fa17f57ffa369ee3543a2301b68d0a9

TBR=jochen@chromium.org

Review URL: https://codereview.chromium.org/950343004

Cr-Commit-Position: refs/heads/master@{#26999}

To avoid undefined behavior.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/977923002

Cr-Commit-Position: refs/heads/master@{#26998}

BUG=

Review URL: https://codereview.chromium.org/975043002

Cr-Commit-Position: refs/heads/master@{#26997}

Function name property is now standardized in ES6. It was a Mozilla proprietary
extension before. With ES6, the property was made configurable, so that it can
be used instead of another proprietary property, displayName.

This is a revert of revert https://chromium.googlesource.com/v8/v8.git/+/c791d8411225aa95518c880defd9a5b1ea243afc.

Last time this broke a Chrome browser test which has since been updated:

https://chromium.googlesource.com/chromium/src/+/5f75a3be4c9334aba627d6c5eb884adf965e1d78

BUG=v8:3333
LOG=N
R=mstarzinger@chromium.org,verwaest@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/977003004

Cr-Commit-Position: refs/heads/master@{#26996}

Port a820568b

Each call to emit_32 uses 5 constant pool slots:
* the "emit_32" string
* undefined (the receiver)
* the argument (heap number)
* the load IC
* the call IC

This change cuts that down 20% to 4, by loading the undefined from the heap roots.

BUG=

Review URL: https://codereview.chromium.org/963193005

Cr-Commit-Position: refs/heads/master@{#26995}

If we use HashMap::Lookup with insert=true, the returned entry may have
NULL as value. This could either mean that the value is 0, or that the
entry has just been inserted. This ambiguity can cause false negatives
in PartialCacheIndexMap::LookupOrInsert.

Also fix a TODO.

R=vogelheim@chromium.org

Review URL: https://codereview.chromium.org/974273002

Cr-Commit-Position: refs/heads/master@{#26994}

BUG=

Review URL: https://codereview.chromium.org/961973002

Cr-Commit-Position: refs/heads/master@{#26993}

Experimental globals are simply flag values on the builtins object to
turn on/off harmony features. We still need to declare them even when
we don't turn on harmony features for the snapshot.

R=vogelheim@chromium.org

Review URL: https://codereview.chromium.org/978813002

Cr-Commit-Position: refs/heads/master@{#26992}

Removing and fixing some embarrassing stuff in js-typed-lowering.

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/981533003

Cr-Commit-Position: refs/heads/master@{#26991}

BUG=

Review URL: https://codereview.chromium.org/975383002

Cr-Commit-Position: refs/heads/master@{#26990}

This makes sure that the implicit exception edges in the graph pass
the correct exception object and also fixes a bug in the dominance
relationship of the value entering the finally block and it's uses.

R=jarin@chromium.org
TEST=cctest/test-run-jsexceptions/FinallyBreak

Review URL: https://codereview.chromium.org/970253002

Cr-Commit-Position: refs/heads/master@{#26989}

Revert of Remove default value for number of threads in Isolate::Init. (patchset #1 id:1 of https://codereview.chromium.org/978773002/)

Reason for revert:
build failures.

Original issue's description:
> Remove default value for number of threads in Isolate::Init.
>
> Just fixing a TODO.
>
> R=jochen@chromium.org
>
> Committed: https://crrev.com/fbcebbc5bdfd8eed82d121faf07b536eb3142fb7
> Cr-Commit-Position: refs/heads/master@{#26987}

TBR=jochen@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/964743003

Cr-Commit-Position: refs/heads/master@{#26988}

Just fixing a TODO.

R=jochen@chromium.org

Review URL: https://codereview.chromium.org/978773002

Cr-Commit-Position: refs/heads/master@{#26987}

Revert of Default-enable external startup data for Linux for stand-alone builds. (patchset #1 id:1 of https://codereview.chromium.org/956373002/)

Reason for revert:
The CL caused two issues:
- a weird build issue on V8 mips builder
- d8 cannot be invoked via PATH, since then it doesn't find its external snapshot.

The 2nd issue might even be WAI, but this needs more consideration.

Original issue's description:
> Default-enable external startup data for Linux for stand-alone builds.
>
> Notes:
> - Other platforms to follow later.
> - This follows Chromium practice, that mostly uses this feature these days.
> - The statically linked-in startup data will stay. So whoever prefers
>   the old way just needs to set the flag differently.
>
> Reland crrev.com/959693002, once crrev.com/960883003 is in.
>
> R=machenbach@chromium.org
> BUG=
>
> Committed: https://crrev.com/a0bdb103b676b4c7fa6b9f2e7149e716549c05d1
> Cr-Commit-Position: refs/heads/master@{#26980}

TBR=machenbach@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/981463005

Cr-Commit-Position: refs/heads/master@{#26986}

Before the max_old_space_size was set for each space, which is not intuitive and not what we want. There is still a miss match between capacity and actual committed memory which should be cleaned up in a follow up cl.

BUG=

Review URL: https://codereview.chromium.org/979783002

Cr-Commit-Position: refs/heads/master@{#26985}

Word32 shifts are always safe on ia32 and x64, independent of whether
SSE4.1 is available.

R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/975363002

Cr-Commit-Position: refs/heads/master@{#26984}

We now have BreakLocation::Iterator to iterate via RelocIterator, and
create a BreakLocation when we are done iterating. The reloc info is
stored in BreakLocation in a GC-safe way and instantiated on demand.

R=ulan@chromium.org
BUG=v8:3924
LOG=N

Review URL: https://codereview.chromium.org/967323002

Cr-Commit-Position: refs/heads/master@{#26983}

Re-installing experimental natives after deserialization causes failures if
said experimental native is already included in the snapshot. However, there
is no way to tell whether a certain harmony feature has been included.

Experimental natives may also be turned on/off on-demand, which a snapshot
that includes them would not support for all cases.

The simple solution for the meantime is to never include experimental natives
in the snapshot and initialize them after deserialization on-demand.

R=vogelheim@chromium.org

Review URL: https://codereview.chromium.org/981473002

Cr-Commit-Position: refs/heads/master@{#26982}

BUG=v8:3929
LOG=y

Review URL: https://codereview.chromium.org/977893002

Cr-Commit-Position: refs/heads/master@{#26981}

Notes:
- Other platforms to follow later.
- This follows Chromium practice, that mostly uses this feature these days.
- The statically linked-in startup data will stay. So whoever prefers
  the old way just needs to set the flag differently.

Reland crrev.com/959693002, once crrev.com/960883003 is in.

R=machenbach@chromium.org
BUG=

Review URL: https://codereview.chromium.org/956373002

Cr-Commit-Position: refs/heads/master@{#26980}

Each call to emit_32 uses 5 constant pool slots:
* the "emit_32" string
* undefined (the receiver)
* the argument (heap number)
* the load IC
* the call IC

This change cuts that down 20% to 4, by loading the undefined from the heap roots.

R=verwaest@chromium.org
BUG=

Review URL: https://codereview.chromium.org/980563002

Cr-Commit-Position: refs/heads/master@{#26979}

Fix Initialize & Dispose for external snapshot. Make sure v8::V8::(Initialize|Dispose) can be called in any order.

This is a follow-on to crrev.com/960883003, which fixed a memory leak in this code, but uncovered another, more subtle bug:

Previously, the code expected you would v8::V8::Initialize once, and v8::V8::Dispose once. The first bug was that in this case the holder_ variable would point to deallocated memory. The second bug was that once the snapshot was disposed, there was no way to get it back on a future Initialize. These are uncovered by the InitializeAndDisposeMultiple test case.

The fix is to keep memory to the raw snapshot and to then cleanly build & destroy the tables in Initialize & Dispose. Since sometimes setNativesBlob is called just after Initialize, that situation must be handled, too.

BUG=

Review URL: https://codereview.chromium.org/974943003

Cr-Commit-Position: refs/heads/master@{#26978}

Until this is addressed, we can simply use the regular IC, as we do
in times of serialization.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/974853002

Cr-Commit-Position: refs/heads/master@{#26977}