R=herhut@chromium.org

Change-Id: Ic7fede18b89a14a8e0af255add5678a70b699475
Reviewed-on: https://chromium-review.googlesource.com/c/1319580Reviewed-by: Stephan Herhut <herhut@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57277}

Phi creation in the code assembler was dependent on the addresses
of the CodeAssemblerVariable::Impl object. This caused non-determinism
in mksnapshot which sometimes occurred on Windows.

This CL adds IDs to CodeAssemblerVariable::Impl objects and ensures
all iterations are done in ID order instead of object address order.


Change-Id: I2b370dc5153202be864a5c13289e70f5ebd59e2e
Bug: v8:8391
Reviewed-on: https://chromium-review.googlesource.com/c/1319749
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57276}

When deserializing the startup snapshot, call IterateStrongRoots with
VISIT_FOR_SERIALIZATION rather than VISIT_ONLY_STRONG. To compensate,
make the StartupDeserializer explicitly iterate over the partial
snapshot cache.

This makes the deserializer and serializer consistent in their use of
the function and makes their differences explicit in the snapshot code
itself.

Bug: chromium:902230
Change-Id: I3a2ac858f4f6b3097b98a10ed2dd5ac5b9bf83e8
Reviewed-on: https://chromium-review.googlesource.com/c/1319585
Commit-Queue: Dan Elphick <delphick@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57275}

- Fix ParseBCP47 to return just the extension. The second argument to
  substr function is actually the length, not the end position of the
  substring :')
- Remove extension keys that aren't part of the relevant extension keys
- Use 'ca' as an relevant extension key for DateTimeFormat
- Use the canonicalized locale tag after create the ICU locale is
  created, rather than the input locale tag.

Bug: chromium:895942, v8:5751
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: I189709714d847e684b04409b734a60ff04ed7dd2
Reviewed-on: https://chromium-review.googlesource.com/c/1291076Reviewed-by: Frank Tang <ftang@chromium.org>
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57274}

Bug: v8:8418
Change-Id: I6d2efdf87bb4fc5454e5a4ee8e5a66463533615e
Reviewed-on: https://chromium-review.googlesource.com/c/1317810
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57273}

This is to ensure the snapshot is deterministic.

Internal fields can contain:
- reference to heap object
- embedder-defined aligned pointer
- a smi

The latter two are not distinguishable by V8, so if the serializer
callback returns non-zero value, we consider it to be an aligned pointer
and clear it to ensure that the snapshot does not contain memory
addresses that may not be deterministic. If the callback returns
{ nullptr, 0 } as result, we consider it to be a smi or some in-place
data that we then serialize verbatim.


R=jgruber@chromium.org

Bug: chromium:870584
Change-Id: I3cf9abf135ffd28d8138fa32636b12596b076e13
Reviewed-on: https://chromium-review.googlesource.com/c/1304441
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57272}

Causing ASAN failures

Bug: v8:5193
Change-Id: I7a899a6390bd1258a1afc8738e85f73239f44a59
Reviewed-on: https://chromium-review.googlesource.com/c/1319583Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57271}

This is a reland of c88994f8

Turned out to not be the issue.

Original change's description:
> Fix Array.prototype.sort speed regression
>
> CanUseSameAccessor<ElementsAccessor: type> is array-sort.tq is super
> performance-critical. Reverting the type-safe cleanup made in this
> function while landing Array.prototype.slice.
>
> Bug=chromium:852764
>
> Change-Id: I1252d2ff8e431581f916794807e59abb39248abb
> Reviewed-on: https://chromium-review.googlesource.com/c/1317815
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Commit-Queue: Daniel Clifford <danno@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#57248}

TBR=danno@chromium.org

Change-Id: I627a131a8525ae4e131c6467561cab9832f3792f
Reviewed-on: https://chromium-review.googlesource.com/c/1319581Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57270}

Bug: chromium:901944
Change-Id: Iaf1dfaa5763162ae7952381fb8b64661d85ea1a8
Reviewed-on: https://chromium-review.googlesource.com/c/1317822Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57269}

Change-Id: Iefea33f47ee4492c9c4d4e105e30f7e2d9128bc7
Reviewed-on: https://chromium-review.googlesource.com/c/1319576Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57268}

Notry: true
Change-Id: Iacc8aadc62956cf5fab13c60a9eaa52318519d62
Bug: v8:7327
Reviewed-on: https://chromium-review.googlesource.com/c/1317813
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Stephan Herhut <herhut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57267}

NOTRY=true
TBR=sergiyb@chromium.org

Bug: v8:8421
Change-Id: Ifbc7271da8a210b197b698f92aad925d3adf7244
Reviewed-on: https://chromium-review.googlesource.com/c/1319579
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57266}

This reverts commit c88994f8.

Reason for revert: Seems to break AccessibilitySelectionTest.List in webkit_unit_tests (https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8-Blink%20Mac/15618)

Original change's description:
> Fix Array.prototype.sort speed regression
> 
> CanUseSameAccessor<ElementsAccessor: type> is array-sort.tq is super
> performance-critical. Reverting the type-safe cleanup made in this
> function while landing Array.prototype.slice.
> 
> Bug=chromium:852764
> 
> Change-Id: I1252d2ff8e431581f916794807e59abb39248abb
> Reviewed-on: https://chromium-review.googlesource.com/c/1317815
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Commit-Queue: Daniel Clifford <danno@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#57248}

TBR=danno@chromium.org,jgruber@chromium.org

Change-Id: Ie447fd0382fee344326d928398595aa450ccdcca
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/1319577Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57265}

This rethrows the underlying expression error if there is one.

Bug: v8:8409
Change-Id: Icc8253e4006c554df9f6a6d850b087b03d88de2d
Reviewed-on: https://chromium-review.googlesource.com/c/1319570Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57264}

Instead of passing and storing uint8_t* and size_t, we now more often
store a Vector or OwnedVector, which encapsulates these two fields.
This provides some more DCHECKs which happen automatically when getting
a subvector into the buffer.

Drive-by: More refactorings and removals of unneeded or rarely used helper
methods.

R=ahaas@chromium.org

Bug: v8:8238
Change-Id: I1b24f90f1517fc50360854f46c2d001075544858
Reviewed-on: https://chromium-review.googlesource.com/c/1317817
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57263}

In particular, output root name instead of root value when detecting accesses
to roots table. For example:

  REX.W cmpq [r13+0x80] (root (0x391473a00569 <Map[16]>)),rbx
  REX.W movq rdi,[r13+0x18] (root (0x391473a007b9 <Map>))
  REX.W movq rdi,[r13-0x20] (root (0x391473a005b9 <the_hole>))

turns into

  REX.W cmpq [r13+0x80] (root (heap_number_map)),rbx
  REX.W movq rdi,[r13+0x18] (root (fixed_array_map))
  REX.W movq rdi,[r13-0x20] (root (the_hole_value))

Bug: v8:8238
Change-Id: I0f7bdcb7774a2fe450f930c1bc2f3ccd03064201
Reviewed-on: https://chromium-review.googlesource.com/c/1317823Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57262}

Currently to obtain a v8::Array out of a C array or a std::vector,
one needs to loop through the elements and call array->Set() multiple
times, and these calls go into v8::Object::Set() which can be slow.
This patch adds a new Array::New overload that converts a
Local<Value>* with known size into a Local<Array>.

Change-Id: I0a768f0e18eec51e78d58be455482ec6425ca188
Reviewed-on: https://chromium-review.googlesource.com/c/1317049Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Joyee Cheung <joyee@igalia.com>
Cr-Commit-Position: refs/heads/master@{#57261}

TBR=sigurds@chromium.org
NOTRY=true

Bug: v8:7783
Change-Id: I17f1c17be365db7398e7e13dd62a6dd86a6cb008
Reviewed-on: https://chromium-review.googlesource.com/c/1319569
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57260}

Unlike other v8::Context getter on v8::Isolate, the v8::Context returned
by GetEnteredOrMicrotaskContext may be non-NativeContext. However,
Blink implicitly assumes all v8::Context is backed by NativeContexts.

This CL updates GetEnteredOrMicrotaskContext() to check the resulting
Context is NativeContext, and updates callers of EnterMicrotaskContext
to use NativeContext.

Change-Id: Ifae528f4ce8feb067f4ad1a43330dc55f4a8ed79
Reviewed-on: https://chromium-review.googlesource.com/c/1301653Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57259}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/b5b1fdc..47ccdba

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/03ce64d..9a5dbc6

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/7e0b0c4..459aaba

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

Change-Id: I24add833a4dee7301efa3f1ee2248351e3864074
Reviewed-on: https://chromium-review.googlesource.com/c/1319250Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#57258}

This reverts commit de88bfb2.

Reason for revert: Breaks msvc build https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Win64%20-%20msvc/5765

Original change's description:
> [wasm-simd] Implement remaining I8x16 SIMD ops on x64
> 
>  - Implementation for I8x16 Shifts, and Mul
>  - Fix convert bug
>  - Enable all tests except for shuffle tests
> 
> Change-Id: Id1a469d2883c30ea782c51d21dc462d211f94420
> Reviewed-on: https://chromium-review.googlesource.com/c/1318609
> Reviewed-by: Bill Budge <bbudge@chromium.org>
> Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#57254}

TBR=bbudge@chromium.org,gdeepti@chromium.org

Change-Id: I09efd8002e27f457e89250336e6c3a12d8d9682c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/1318097Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57257}

This should allow for better parallelization when running these tests.

Change-Id: Ib3cae7d6e8f0d2608470ca616eeac7eecae3b7ab
Reviewed-on: https://chromium-review.googlesource.com/c/1318094Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57256}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/cd2c8fe..b5b1fdc

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/8c035b3..03ce64d

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

Change-Id: I5df515eea0c133826fcc1a78fb2453a2a8043c98
Reviewed-on: https://chromium-review.googlesource.com/c/1318093
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#57255}

 - Implementation for I8x16 Shifts, and Mul
 - Fix convert bug
 - Enable all tests except for shuffle tests

Change-Id: Id1a469d2883c30ea782c51d21dc462d211f94420
Reviewed-on: https://chromium-review.googlesource.com/c/1318609Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57254}

TBR=machenbach@chromium.org

Bug: chromium:899721
Change-Id: Ifdb4864e47a56cb0fe2565e44e79f3def496b138
Reviewed-on: https://chromium-review.googlesource.com/c/1317821
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57253}

and split Smi out of objects.h into smi.h.

Bug: v8:3770, v8:5402
Change-Id: I5ff7461495d29c785a76c79aca2616816a29ab1e
Reviewed-on: https://chromium-review.googlesource.com/c/1313035Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57252}

Change-Id: I273764acb3881a5f682d3cc77e2c8f66bbb7b071
Reviewed-on: https://chromium-review.googlesource.com/c/1318091Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#57251}

This will give us some clusterfuzz coverage.

Bug: v8:7871
Change-Id: I670572454e196b7617a446769216722302f697a9
Reviewed-on: https://chromium-review.googlesource.com/c/1306973Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57250}

Bug: v8:7834
Change-Id: Ib53448757bbaf785ff39ba0da6f54c91e449035b
Reviewed-on: https://chromium-review.googlesource.com/c/1314113Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57249}

CanUseSameAccessor<ElementsAccessor: type> is array-sort.tq is super
performance-critical. Reverting the type-safe cleanup made in this
function while landing Array.prototype.slice.

Bug=chromium:852764

Change-Id: I1252d2ff8e431581f916794807e59abb39248abb
Reviewed-on: https://chromium-review.googlesource.com/c/1317815Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57248}

The maps in question are already processed in
NativeContextData::Serialize.

R=jarin@chromium.org

Bug: v8:7790
Change-Id: Ifbbff64e10458605b09c74fe09e574b2f2659839
Reviewed-on: https://chromium-review.googlesource.com/c/1317809
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57247}

In particular FunctionLiteral body. Now clients cannot use
function_literal->body() == nullptr anymore to figure out whether it was
preparsed; but have to check the eager compile hint.

Change-Id: Ia0d3a6b51c6fb7e803157e98a9d224224e03c8a7
Reviewed-on: https://chromium-review.googlesource.com/c/1317811Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57246}

Use early returns instead. The general scheme is to return early in the
abnormal case (e.g. error) and fall through to the end of the method in
the normal case.

R=ahaas@chromium.org

Bug: v8:8238
Change-Id: I281d35f5aad1f51b6d476fdc685565d9819397bb
Reviewed-on: https://chromium-review.googlesource.com/c/1317812
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57245}

A Property access is only a valid reference expression if the accessed object
is a valid expression.

Bug: v8:8409
Change-Id: I9bc9ac60ca3bf4e261d10af97aba18e9db2085ea
Reviewed-on: https://chromium-review.googlesource.com/c/1317816Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57244}

R=herhut@chromium.org

Change-Id: Ice45defac8f065b6b1c848fd42ead6ab46da89ab
Reviewed-on: https://chromium-review.googlesource.com/c/1317573Reviewed-by: Stephan Herhut <herhut@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57243}

- Add the WeakRef class and its deref() function.

- Add WeakFactory.prototype.makeRef

- Implement the "keep during job" behavior for WeakRef constructor and deref().

- Here we keep the targets alive longer than until the end of the job
  (microtask), contradicting the spec. However, this is probably the indended
  behavior, see https://github.com/tc39/proposal-weakrefs/issues/39 .

BUG=v8:8179

Change-Id: I41990d41ac1799e34f675d8431b9a7aa7ed3d48d
Reviewed-on: https://chromium-review.googlesource.com/c/1306435
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57242}

This is resurrecting an optimization from the pre-torque version.
Avoid allocating another sequential string for the result when there's only one
element, just return the ToString-ed element.  This not only saves time writing
to this destination string, but also reduce GC pressure.

The System Health Memory Benchmark (load:media:google_images) exposed this missing
optimization with a 15% regression in memory usage.  Very large external strings
were being copied into V8's heap as sequential string.

Bug: chromium:896612
Change-Id: Ieb61906f64100cdc15bf96f3ebcccb1207f75356
Reviewed-on: https://chromium-review.googlesource.com/c/1316620Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
Cr-Commit-Position: refs/heads/master@{#57241}

This is a reland of 7bd9eb7e. No changes
to that patch other than adding a test case. The bug that lead to the
revert has been fixed in 9bf8f72c.

Original change's description:
> Add fast paths to Array.from.
>
> This reuses the fast path from IterableToList for Array.from. The fast
> paths are taken when .from is called with the receiver Array and the only
> argument is the iterable (no mapping function or thisArg).
>
> Bug: v8:7980
> Change-Id: I975b0c5e3f838262d7b71ad4dec5111fb031d746
> Reviewed-on: https://chromium-review.googlesource.com/c/1297322
> Commit-Queue: Hai Dang <dhai@google.com>
> Reviewed-by: Georg Neis <neis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#56993}

Bug: v8:7980
Change-Id: Id081837946c0989ec2b31ce991f48d09e0219b09
Reviewed-on: https://chromium-review.googlesource.com/c/1317586Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57240}

The relocation mode in question was by now only used in tests to model a
wrapper call from wrapper code (on the GC'ed heap) to a non-movable wasm
code object. Instead of using a special relocation mode, we switch to
using the existing {EXTERNAL_REFERENCE} mode similar to other static C++
functions called from generated code.

R=sigurds@chromium.org
BUG=v8:8238

Change-Id: I30af98b92aed207c52ccccaf018a455ecac39c2b
Reviewed-on: https://chromium-review.googlesource.com/c/1309821Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57239}

This introduces a new syntax for identifiers and calls: modulename::foo.
Such a name is resolved by trying to find a module modulename in one of
the parent scopes and looking for foo there. So this roughly corresponds
to C++ qualified namespace lookup.

Bug: v8:7793
Change-Id: Iedc43e6ebe125cd74575cbbcbf990bbcc0155a1f
Reviewed-on: https://chromium-review.googlesource.com/c/1309818
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57238}