- support new v8.log-based source
- fix function name resolution from v8.log
- simplify displaying and add direct links to source files

Change-Id: Ice1acdd9ebaefb27387fecc5446b973bf323dbcc
NOTRY=true

Change-Id: Ice1acdd9ebaefb27387fecc5446b973bf323dbcc
Reviewed-on: https://chromium-review.googlesource.com/474824
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44579}

Allowing a user handler for segv is default in GN, but not in GYP. We pass it now explicitly to make the last gyp bot temporarily happy.

TBR=vogelheim@chromium.org

Bug: chromium:710409
Change-Id: Ib997245f348481158bd8d64192ac653b60237452
Reviewed-on: https://chromium-review.googlesource.com/474147Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44578}

See https://tc39.github.io/proposal-regexp-unicode-property-escapes

R=jgruber@chromium.org
BUG=v8:4743

Review-Url: https://codereview.chromium.org/2807293003
Cr-Commit-Position: refs/heads/master@{#44577}

This constructs different typed arrays from different types of other
typed arrays, hopefully countering microbenchmarks which are able to
optimize for exactly one pair of types.

Bug: v8:5977
Change-Id: Ie3b07d6ecaaca6db0be410e902e437a2a643d71c
Reviewed-on: https://chromium-review.googlesource.com/474748Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44576}

Reland of [date] Add ICU backend for timezone info behind a flag (patchset #1 id:1 of https://codereview.chromium.org/2811103002/ )

Reason for revert:
Reland with tests marked as off in no-i18n mode

Original issue's description:
> Revert of [date] Add ICU backend for timezone info behind a flag (patchset #17 id:320001 of https://codereview.chromium.org/2724373002/ )
>
> Reason for revert:
> Breaks noi18n:
> https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20noi18n%20-%20debug/builds/13314
>
> Original issue's description:
> > [date] Add ICU backend for timezone info behind a flag
> >
> > This patch implements a timezone backend which is based on ICU, rather
> > than operating system calls. It can be turned on by passing the
> > --icu-timezone-data flag. The goal here is to take advantage of ICU's
> > data, which is more complete than the data that some system calls expose.
> > For example, without any special code, this patch fixes the time zone
> > of Lord Howe Island to have a correct 30 minute DST offset, rather than
> > 60 minutes as the OS backends assume it to have.
> >
> > Unfortunately, the parenthized timezone name in Date.prototype.toString()
> > differs across platforms. This patch chooses the long timezone name,
> > which matches Windows behavior and might be the most intelligible, but
> > the web compatibility impact is unclear.
> >
> > BUG=v8:6031,v8:2137,v8:6076
> >
> > Review-Url: https://codereview.chromium.org/2724373002
> > Cr-Commit-Position: refs/heads/master@{#44562}
> > Committed: https://chromium.googlesource.com/v8/v8/+/b213f2399038a615cdfbfa0201cddc113d304018
>
> TBR=ulan@chromium.org,jshin@chromium.org,jgruber@chromium.org,littledan@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:6031,v8:2137,v8:6076
>
> Review-Url: https://codereview.chromium.org/2811103002
> Cr-Commit-Position: refs/heads/master@{#44565}
> Committed: https://chromium.googlesource.com/v8/v8/+/13ad50811024ace5623d5d4d13cea4ef21f4affd

TBR=ulan@chromium.org,jshin@chromium.org,jgruber@chromium.org,machenbach@chromium.org
BUG=v8:6031,v8:2137,v8:6076

Review-Url: https://codereview.chromium.org/2813863002
Cr-Commit-Position: refs/heads/master@{#44575}

This is a noop right now as we run test262 without variants on asan.

We'll use the status file to whitelist the variants in a synchronous way in v8 after the infra change lands to activate them.

Bug: chromium:710428
NOTRY=true

Change-Id: I146bbc648775ef0e250c16695b956ecd1d6e105e
Reviewed-on: https://chromium-review.googlesource.com/474845
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Daniel Ehrenberg <littledan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44574}

This a step towards using CompilerDispatcher in parallel
parsing.

BUG=v8:6093

Change-Id: Idee84105e342950badb5694fa2a850e05430abaa
Reviewed-on: https://chromium-review.googlesource.com/473246
Commit-Queue: Wiktor Garbacz <wiktorg@google.com>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44573}

A really slight change in behaviour introduced by
https://github.com/tc39/proposal-async-iteration/commit/395b2e3b2f5acb62f9fae11c5e189423d4af50e6

Just swaps the order that properties are loaded from an iterator result
object in the various Async-from-Sync Iterator methods.

Fixes for the test262 tests have been submitted already (https://github.com/tc39/test262/pull/961).

BUG=v8:5855, v8:6242
R=littledan@chromium.org, jwolfe@igalia.com,

Change-Id: I1ff0e1b7758c126d02aec27d67ceeb15b91c06cf
Reviewed-on: https://chromium-review.googlesource.com/474087Reviewed-by: Daniel Ehrenberg <littledan@chromium.org>
Commit-Queue: Caitlin Potter <caitp@igalia.com>
Cr-Commit-Position: refs/heads/master@{#44572}

The goal of this patch was to refactor NumberFormat parameter handling
to be usable by a PluralRules implementation. Along the way, I found
and fixed a couple minor issues where options handling differed from
the specification, and removed some dead code. Regression tests are
added as test262 tests. With this change, the overall flow more closely
resembles the specification plus this editorial change which is out
for review: https://github.com/tc39/ecma402/pull/130/files

BUG=v8:6015,v8:6016
R=yangguo,jungshik

Review-Url: https://codereview.chromium.org/2717613005
Cr-Commit-Position: refs/heads/master@{#44571}

This a step towards using CompilerDispatcher in parallel
parsing.

BUG=v8:6093

Change-Id: I7c0dc0a5f5b25652a8aa98c94b1e069c1f081a5b
Reviewed-on: https://chromium-review.googlesource.com/473106Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Wiktor Garbacz <wiktorg@google.com>
Cr-Commit-Position: refs/heads/master@{#44570}

The spec proposal has been updated to drop contributory binary
properties such as `Other_ID_Start` and `Other_ID_Continue`.

This patch reverts commit 26e5d012 and
adds tests to ensure these properties are not supported.

R=
BUG=v8:4743

Review-Url: https://codereview.chromium.org/2809143003
Cr-Commit-Position: refs/heads/master@{#44569}

Move dead bytecode elimination from a seperate bytecode pipeline optimizer
into the BytecodeArrayWriter. This removes the last bytecode pipeline
optimizer, which means we can remove the Bytecode pipeline which,
which should increase compile speed.

BUG=v8:6194

Change-Id: I47fb3c3463b2b8a92e02cf7a6b608683fcfa5261
Reviewed-on: https://chromium-review.googlesource.com/471407
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44568}

Bug: chromium:677032
NOTRY=true

Change-Id: I820e9c89677f4028107719547c372f91e5feb271
Reviewed-on: https://chromium-review.googlesource.com/474805
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44567}

Bug: chromium:705962
NOTRY=true

Change-Id: I734df88af104a9e9800600fee7f41cee5a128450
Reviewed-on: https://chromium-review.googlesource.com/474031Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44566}

Revert of [date] Add ICU backend for timezone info behind a flag (patchset #17 id:320001 of https://codereview.chromium.org/2724373002/ )

Reason for revert:
Breaks noi18n:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20noi18n%20-%20debug/builds/13314

Original issue's description:
> [date] Add ICU backend for timezone info behind a flag
>
> This patch implements a timezone backend which is based on ICU, rather
> than operating system calls. It can be turned on by passing the
> --icu-timezone-data flag. The goal here is to take advantage of ICU's
> data, which is more complete than the data that some system calls expose.
> For example, without any special code, this patch fixes the time zone
> of Lord Howe Island to have a correct 30 minute DST offset, rather than
> 60 minutes as the OS backends assume it to have.
>
> Unfortunately, the parenthized timezone name in Date.prototype.toString()
> differs across platforms. This patch chooses the long timezone name,
> which matches Windows behavior and might be the most intelligible, but
> the web compatibility impact is unclear.
>
> BUG=v8:6031,v8:2137,v8:6076
>
> Review-Url: https://codereview.chromium.org/2724373002
> Cr-Commit-Position: refs/heads/master@{#44562}
> Committed: https://chromium.googlesource.com/v8/v8/+/b213f2399038a615cdfbfa0201cddc113d304018

TBR=ulan@chromium.org,jshin@chromium.org,jgruber@chromium.org,littledan@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:6031,v8:2137,v8:6076

Review-Url: https://codereview.chromium.org/2811103002
Cr-Commit-Position: refs/heads/master@{#44565}

All the optimizations have now been moved to either the BytecodeGenerator
or the BytecodeArrayWriter/Builder.

BUG=v8:6194

Change-Id: Ie5c5d55e824c94ffb503af376c72bc64ad1f6f81
Reviewed-on: https://chromium-review.googlesource.com/469349
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44564}

This fixes {JSCreateLowering} to traverse boilerplate objects in the
same order the runtime uses (i.e. properties first, elements second).
That order is hard-coded in the nesting of {AllocationSite} objects.

R=bmeurer@chromium.org
TEST=mjsunit/regress/regress-crbug-709537
BUG=chromium:709537

Change-Id: I8f446a0880448ea88a3e242e92d11d611581a42b
Reviewed-on: https://chromium-review.googlesource.com/474028Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44563}

This patch implements a timezone backend which is based on ICU, rather
than operating system calls. It can be turned on by passing the
--icu-timezone-data flag. The goal here is to take advantage of ICU's
data, which is more complete than the data that some system calls expose.
For example, without any special code, this patch fixes the time zone
of Lord Howe Island to have a correct 30 minute DST offset, rather than
60 minutes as the OS backends assume it to have.

Unfortunately, the parenthized timezone name in Date.prototype.toString()
differs across platforms. This patch chooses the long timezone name,
which matches Windows behavior and might be the most intelligible, but
the web compatibility impact is unclear.

BUG=v8:6031,v8:2137,v8:6076

Review-Url: https://codereview.chromium.org/2724373002
Cr-Commit-Position: refs/heads/master@{#44562}

Review-Url: https://codereview.chromium.org/2811953003
Cr-Commit-Position: refs/heads/master@{#44561}

Moves the logic for eliding non-effectful accumulator load elision from the
peephole optimizer to the BytecodeArrayWriter.

BUG=v8:6194

Change-Id: I05fbe4ee8ac340e5c355285d0b47e4a9d52fd0a8
Reviewed-on: https://chromium-review.googlesource.com/469828
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44560}

Add support for I32x4Mul, I32x4MaxS, I32x4MinS, I32x4Eq,
I32x4Ne, I32x4Shl, I32x4ShrS, I32x4ShrU, I32x4MaxU,
I32x4MinU, S32x4Select operations for mips32 and mips64
architectures

BUG=

Review-Url: https://codereview.chromium.org/2780713003
Cr-Commit-Position: refs/heads/master@{#44559}

R=danno@chromium.org

Review-Url: https://codereview.chromium.org/2796343002
Cr-Commit-Position: refs/heads/master@{#44558}

Bug: v8:4742
Change-Id: I6f9583cd25c4a8b038e665ea18a20abf29d8b376
Reviewed-on: https://chromium-review.googlesource.com/471107Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Loo Rong Jie <loorongjie@gmail.com>
Cr-Commit-Position: refs/heads/master@{#44557}

IsNumber returns true for Smi/HeapNumber arguments.

IsNumberNormalized expects a number argument and returns true if
it is either a Smi, or a HeapNumber with a value outside the Smi
range.

BUG=

Review-Url: https://codereview.chromium.org/2813623003
Cr-Commit-Position: refs/heads/master@{#44556}

Enable separatio of ic, bytecode, builtin and stub entries through:
    --separate-ic=true
    --separate-bytecodes=true
    --separate-builtins=true
    --separate-stubs=true

Change-Id: I6da4be7add093bb54abe956c60cd186e735ed9b5
Reviewed-on: https://chromium-review.googlesource.com/473046
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44555}

R=clemensh@chromium.org
TEST=mjsunit/asm/call-collisions
BUG=v8:6202

Change-Id: Ie382ed011defb0146c07336b1fd65532ecc20e2e
Reviewed-on: https://chromium-review.googlesource.com/473146Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44554}

* Use BIND, VARIABLE macros everywhere.
* Unify fast path check functions.
* Asserts in CSA::StringCharCodeAt.

BUG=

Review-Url: https://codereview.chromium.org/2811063003
Cr-Commit-Position: refs/heads/master@{#44553}

Bug: chromium:709420
TBR=marja@chromium.org

Change-Id: I71cf02137bcc7d8e163162c6dc1be6b906422281
Reviewed-on: https://chromium-review.googlesource.com/474747Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44552}

This patch implements the runtime semantics of dynamic import.

We create a new ASTNode so that we can pass the JSFunction closure() to
the runtime function from which we get the script_url.

d8 implements the embedder logic required to load and evaluate the modules.

The API is mostly implemented as specified.

BUG=8:5785

Review-Url: https://codereview.chromium.org/2703563002
Cr-Commit-Position: refs/heads/master@{#44551}

According to the spec, section names must be valid UTF-8. This CL adds
a check for that.
Imported and exported names were already checked before.
In order to use the {consume_string} function from the
WasmSectionIterator, it moved it out of the ModuleDecoder into the
anonymous namespace. It now also gets a name for the string to be
parsed, for better error messages.

R=rossberg@chromium.org

Change-Id: I20b1ddb0bd1c7ada237d8303951073310fe1c714
Reviewed-on: https://chromium-review.googlesource.com/470207
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Andreas Rossberg <rossberg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44550}

Other_ID_Start and Other_ID_Continue are not supported by ICU, so for
now we implement these manually as special binary property classes.

R=jgruber@chromium.org
BUG=v8:4743

Review-Url: https://codereview.chromium.org/2808803002
Cr-Commit-Position: refs/heads/master@{#44549}

This reverts commit 751e8935.

Reason for revert: Breaks layout tests:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/14885

See:
https://github.com/v8/v8/wiki/Blink-layout-tests

Original change's description:
> [ignition] Add call bytecodes for undefined receiver
> 
> Adds a collection of call bytecodes which have an implicit undefined
> receiver argument, for cases such as global calls where we know that the
> receiver has to be undefined. This way we can skip an LdaUndefined,
> decrease bytecode register pressure, and set a more accurate
> ConvertReceiverMode on the interpreter and TurboFan call.
> 
> As a side effect, the "normal" Call bytecode now becomes a rare case
> (only with calls and super property calls), so we get rid of its 0-2
> argument special cases and modify CallProperty[N] to use the
> NotNullOrUndefined ConvertReceiverMode.
> 
> Change-Id: I9374a32fefd66fc0251b5193bae7a6b7dc31eefc
> Reviewed-on: https://chromium-review.googlesource.com/463287
> Commit-Queue: Leszek Swirski <leszeks@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#44530}

TBR=rmcilroy@chromium.org,mstarzinger@chromium.org,leszeks@chromium.org,v8-reviews@googlegroups.com,v8-mips-ports@googlegroups.com,v8-ppc-ports@googlegroups.com,v8-x87-ports@googlegroups.com,bmeurer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I7629dec609d0ec938ce7105d6c1c74884e5f9272
Reviewed-on: https://chromium-review.googlesource.com/474744
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44548}

This reverts commit a79f9031.

Reason for revert: Need to revert:
https://chromium-review.googlesource.com/c/463287/

Original change's description:
> [Interpreter] Unify approach to building interpreter handler and Turbofan stubs.
> 
> Moves interpreter-generator.cc to a similar model of building handlers as
> Turbofan stubs elsewhere, to simplify moving code between stubs / builtins and
> bytecode handlers. This removes the "__" hack from the Interpreter generator
> code.
> 
> Also make SetBytecodeOffset private to InterpreterAssembler and make 
> LdaImmutable[Current]ContextSlot and Lda[Current]ContextSlot share
> handlers since they are identical.
> 
> Change-Id: I9e91e7d37c2ea75513e4dcc3b95b4bb6517f83da
> Reviewed-on: https://chromium-review.googlesource.com/471987
> Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#44534}

TBR=rmcilroy@chromium.org,jkummerow@chromium.org,leszeks@chromium.org,ishell@chromium.org,cbruni@chromium.org,v8-reviews@googlegroups.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I5c72a8a20ab6b8fd862427e1703c883fa484a2c1
Reviewed-on: https://chromium-review.googlesource.com/474745Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44547}

Revert of PPC/s390: [ignition] Add call bytecodes for undefined receiver (patchset #1 id:1 of https://codereview.chromium.org/2809743003/ )

Reason for revert:
Need to revert:
https://chromium-review.googlesource.com/c/463287/

Original issue's description:
> PPC/s390: [ignition] Add call bytecodes for undefined receiver
>
> Port 751e8935
>
> Original Commit Message:
>
>     Adds a collection of call bytecodes which have an implicit undefined
>     receiver argument, for cases such as global calls where we know that the
>     receiver has to be undefined. This way we can skip an LdaUndefined,
>     decrease bytecode register pressure, and set a more accurate
>     ConvertReceiverMode on the interpreter and TurboFan call.
>
>     As a side effect, the "normal" Call bytecode now becomes a rare case
>     (only with calls and super property calls), so we get rid of its 0-2
>     argument special cases and modify CallProperty[N] to use the
>     NotNullOrUndefined ConvertReceiverMode.
>
> R=leszeks@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
> BUG=
> LOG=N
>
> Review-Url: https://codereview.chromium.org/2809743003
> Cr-Commit-Position: refs/heads/master@{#44539}
> Committed: https://chromium.googlesource.com/v8/v8/+/41b228057f89e73fbaae867177d523e60d4e92bc

TBR=joransiu@ca.ibm.com,jyan@ca.ibm.com,leszeks@chromium.org,michael_dawson@ca.ibm.com,bjaideep@ca.ibm.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/2809093002
Cr-Commit-Position: refs/heads/master@{#44546}

Before serializing an external string for a native source, we replace
its resource field with the type and index of the native source. Upon
deserialization, we restore the resource.

This change also removes the native source caches with a more straight-
forward mechanism to find the resource type and index.

R=ulan@chromium.org

Review-Url: https://codereview.chromium.org/2807023003
Cr-Commit-Position: refs/heads/master@{#44545}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/6c97eff..94c06fe

Rolling v8/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+log/87e8335..9a55aba

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/e9f3127..49df471

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

Change-Id: Ie59326de4a9c959e88e604968b6133e9d4677cb8
Reviewed-on: https://chromium-review.googlesource.com/473869Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44544}

Fix error message printed by Runtime_ThrowCalledNonCallable.

As noted on the bug, this has a slight problem in that it will always
print that "asyncIterator" was not callable for GetIterator with an
async IteratorType, though it may be referring to a different call.
This issue is present regardless of the change I introduced to perform
this desugaring in the BytecodeGenerator.

BUG=v8:6187
R=adamk@chromium.org, verwaest@chromium.org

Change-Id: I2077b7cd5976d9d9ba044f0dff44ee8c312d1263
Reviewed-on: https://chromium-review.googlesource.com/470806Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Caitlin Potter <caitp@igalia.com>
Cr-Commit-Position: refs/heads/master@{#44543}

BUG=v8:4614
R=binji@chromium.org,jarin@chromium.org

Review-Url: https://codereview.chromium.org/2799863002
Cr-Commit-Position: refs/heads/master@{#44542}

- Adds WASM opcodes I32x4SConvertI16x8Low, I32x4SConvertI16x8High,
  I32x4UConvertI16x8Low, I32x4UConvertI16x8High, which unpack half of
  an I16x8 register into a whole I32x4 register, with signed or unsigned
  extension. Having separate Low/High opcodes works around the difficulty
  of having multiple output registers, which would be necessary if we unpacked
  the entire I16x8 register.

- Adds WASM opcodes I16x8SConvertI8x16Low, I16x8SConvertI8x16High,
  I16x8UConvertI8x16Low, I16x8UConvertI8x16High, similarly to above.

- Adds WASM opcodes I16x8SConvertI32x4, I16x8UConvertI32x4,
  I8x16SConvert16x8, I8x16UConvertI16x8, which pack two source registers
  into a single destination register with signed or unsigned saturation. These
  could have been separated into half operations, but this is simpler to
  implement with SSE, AVX, and is acceptable on ARM. It also avoids adding
  operations that only modify half of their destination register.

- Implements these opcodes for ARM.

LOG=N
BUG=v8:6020

Review-Url: https://codereview.chromium.org/2800523002
Cr-Commit-Position: refs/heads/master@{#44541}

LOG=N
BUG=v8:6020

Review-Url: https://codereview.chromium.org/2797923006
Cr-Original-Commit-Position: refs/heads/master@{#44536}
Committed: https://chromium.googlesource.com/v8/v8/+/6588187ae3acaa5b40762c539ee9fe355551bea3
Review-Url: https://codereview.chromium.org/2797923006
Cr-Commit-Position: refs/heads/master@{#44540}