Proposal repository:
https://github.com/tc39/proposal-global

Intent to ship:
https://groups.google.com/d/msg/v8-users/Vkoh0wXRwaM/Yt7MpzhkAgAJ

Bug: v8:5537
Change-Id: I60a6c5375165d89548db12fef454a64137d04c27
Reviewed-on: https://chromium-review.googlesource.com/1195494Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55543}

If profiling is done with --log-source-code profview will now display
a "View source" link for each function in the tree view. Clicking this
will show a new source viewer, with sampled lines highlighted. See the
associated bug for screenshots.

This patch also fixes a bug in the profiler where the source info of
only the first code object for each function would be logged, and
includes some refactoring.

Bug: v8:6240
Change-Id: Ib96a9cfc54543d0dc9bef4657cdeb96ce28b223c
Reviewed-on: https://chromium-review.googlesource.com/1194231
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55542}

The %GetPrototype runtime function is not used anymore. Also remove the
cctests that were introduced to guard the Crankshaft optimizations for
the %_GetPrototype intrinsic.

Bug: v8:8015
Change-Id: I4b848f2c8d67209dae002d260a26867299d6b4a5
Reviewed-on: https://chromium-review.googlesource.com/1199106Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55541}

In the KeyedLoadICGeneric case the engine previously immediately fell
back to the %KeyedGetProperty runtime function if the key was not a
Name or a valid array index. This turns out to be really slow if a
program passes for example objects as keys. Since we already have all
the logic in place to convert an arbitrary JavaScript value to a Name,
we can just call into ToName first and then operate on the result of
that, which is significantly faster since C++ usually doesn't need to
call back into JavaScript then to convert a JSReceiver into a Name.

This also changes the ToName builtin to use the existing builtin for
NonPrimitiveToPrimitive, which stays in JavaScript land completely.
Since there's not really a point in inlining ToName into the call
sites, the other uses were also changed to call the builtin instead,
which saves some space and might also help with instruction cache
utilization (especially when the ToName logic is more involved now).

This improves the performance on the microbenchmark

```js
const n = 1e7;
const obj = {};
const key = [1,2];

const start = Date.now();
for (let i = 0; i < n; ++i) {
  if (obj[key] === undefined) obj[key] = key;
}
print(`time: ${Date.now() - start} ms.`);
```

by up to 36%. On the ARES-6 ML benchmark the steady state improves by up
to ~7% and the overall mean for ARES-6 ML improves by up to ~6%. Further
improvements might be possible here if the GetProperty builtin could be
made faster for common prototype lookups like Symbol.toPrimitive and the
"valueOf" and "toString" functions.

Bug: v8:6344, v8:6670
Change-Id: Ic3ac2bc4d4277836ef03039de4eda5c5f66a85da
Reviewed-on: https://chromium-review.googlesource.com/1199022
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55540}

Teach the GetProperty builtin how to perform [[Get]] on JSProxy
instances by calling into the dedicated ProxyGetProperty builtin
that we already use for the LOAD_IC / KEYED_LOAD_IC. This is
important when proxies are used in places were GetProperty builtin
is used like for example as iterables in for..of loops or in spreads.

On a simple micro-benchmark like the following

```js
const proxy = new Proxy([1, 2, 3], {
  get(target, property) { return target[property]; }
});
const TESTS = [
    function testForOfProxy() { for (const x of proxy) {} },
    function testSpreadProxy() { return [...proxy]; }
];

function test(fn) {
  var result;
  for (var i = 0; i < 1e6; ++i) result = fn();
  return result;
}
test(x => x);

for (var j = 0; j < TESTS.length; ++j) test(TESTS[j]);
for (var j = 0; j < TESTS.length; ++j) {
  var startTime = Date.now();
  test(TESTS[j]);
  print(TESTS[j].name + ':', (Date.now() - startTime), 'ms.');
}
```

improves from around

  testForOfProxy: 1672.6 ms.
  testSpreadProxy: 1956.6 ms.

to

  testForOfProxy: 408.4 ms.
  testSpreadProxy: 530.8 ms.

on average, which corresponds to a 4-5x performance improvement, even
for small arrays. On the ARES-6 Air benchmark this completely eliminates
all calls to the %GetProperty runtime function, and thereby improves the
steady state mean by 2-3%.

Bug: v8:6344, v8:6557, v8:6559
Change-Id: Ifebdaff8f3ae5899a33ce408ecd54655247f3a02
Reviewed-on: https://chromium-review.googlesource.com/1199023Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55539}

chromeos_daisy_chromium_compile_only_ng has been
deleted and was removed from Buildbucket in
https://chromium-review.googlesource.com/c/chromium/src/+/1195731

BUG=v8:8058

Change-Id: I42adaca73f0b04cf553e16f215f92ed2f5a7a010
Reviewed-on: https://chromium-review.googlesource.com/1198242Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55538}

The expectation is changed in https://chromium-review.googlesource.com/c/chromium/src/+/1196032

revert of https://chromium-review.googlesource.com/c/v8/v8/+/1188143
to reland https://chromium-review.googlesource.com/c/v8/v8/+/1185763

v8:7961

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Change-Id: I461db83b377c31abda72f2ce9c4501fcdd3b2663
Reviewed-on: https://chromium-review.googlesource.com/1195539Reviewed-by: Jungshik Shin <jshin@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55537}

Change-Id: I4b810b3684609f19cef3adf295ac104d00b9a4c3
Reviewed-on: https://chromium-review.googlesource.com/1194441Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55536}

- Cleans up existing code that tests for representations using a
  bitmask.
- Bypass FP register allocation for sequences without FP vregs.

Change-Id: I5ff32e80e0c33848ba83ee17f786b01e37821aa2
Reviewed-on: https://chromium-review.googlesource.com/1195528
Commit-Queue: Bill Budge <bbudge@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55535}

This CL fixes a bug where the receiving instance was updated improperly
in the dispatch table(s) of an imported table.

BUG=chromium:875322
R=mstarzinger@chromium.org

Change-Id: Ib5af238a0847bf332a12863523e897f59f137c1d
Reviewed-on: https://chromium-review.googlesource.com/1196886Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55534}

Tbr: gsathya@chromium.org
Change-Id: I293e5eb686e2ba92386efb908d3437b2afdd152d
Reviewed-on: https://chromium-review.googlesource.com/1196683Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55533}

We have an API (GetCodeRange) which gives the location of V8 code on the
heap, but builtin code no longer lives on the heap.

The upcoming work on the V8 stack unwinder requires the embedder to
provide the code ranges for both the heap and builtins, so this API will
be used there.

Bug: v8:8116
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I15e900716e68256b9732be0ea1a5cda24878eccf
Reviewed-on: https://chromium-review.googlesource.com/1196551Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55532}

This is a naive implementation of a class that manages regions
allocation/deallocation inside given range of addresses.

This code will be used in a follow-up CLs.

Bug: v8:8096
Change-Id: I7bea7051a1525cc7f87ba34d67b85b274c5de18a
Reviewed-on: https://chromium-review.googlesource.com/1127175Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55531}

This addresses a TODO in JSTypedLowering and generally makes the more
easier to follow since the methods deal only with one kind of Node now.

Bug: v8:8015
Change-Id: I8c3521b8d630dbe272264dc01e9ab3a5b0a8f682
Reviewed-on: https://chromium-review.googlesource.com/1196883Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55530}

Revert "Reland "[heap] Attempt to incorporate backing store counters into heap sizing and GC trigger stragery.""

This reverts commit eb164dbd.

Revert "[d8] Fixed external gc test (limit multiplied by number of isolates)."

This reverts commit 38cbc26a.

Revert "[heap] Fixed typo in method name."

This reverts commit 263174af.

Bug: chromium:845409, chromium:879045
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I555bcff2ad04ae23368c7b3999a237083010f9c6
Reviewed-on: https://chromium-review.googlesource.com/1196550Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55529}

This is a purely cosmetic change to make the Number constructor
in the JSCallReducer easier to read.

Bug: v8:7904, v8:8015
Change-Id: Id3248dcf9c4e8111bb4f0418bfa6993630df74bb
Reviewed-on: https://chromium-review.googlesource.com/1196432Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55528}

This CL removes a regression test that was intended to check that the
maximum call stack size was not exceeded when calling Array.p.sort.

As the new sorting algorithm (TimSort) does not work recursively, this
test is no longer really necessary. It is also rather slow and causes
issues on some bots, so we remove the test.

R=mslekova@chromium.org

Bug: v8:7783
Change-Id: I5bb9693ab825fe077776fd6825688545286285fd
Reviewed-on: https://chromium-review.googlesource.com/1196511Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Simon Zünd <szuend@google.com>
Cr-Commit-Position: refs/heads/master@{#55527}

This adds experimental support for an 'except_ref' value type for caught
exceptions as per the exception handling proposal. In the current for it
is only allowed to have such types in the stack or in a local, support
for having it as part of any signature was left out.

The default value for a local of type 'except_ref' is the 'ref_null'
value for now. Since this value cannot escape a wasm function, the
concrete value is not actually observable.

R=ahaas@chromium.org
TEST=unittests/LocalDeclDecoderTest.ExceptRef,mjsunit/wasm/exceptions
BUG=v8:8091

Change-Id: I7bd65274327a833262f8749cbe0e24e737f6e0c1
Reviewed-on: https://chromium-review.googlesource.com/1196510Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55526}

This CL fixes a bug if the second argument ('from') for lastIndexOf
changes the array when its converted to an integer.

R=jgruber@chromium.org

Bug: chromium:878845
Change-Id: I8759dd19381c63f0dde1d4c5abc1b6c7291c6048
Reviewed-on: https://chromium-review.googlesource.com/1196507Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Simon Zünd <szuend@google.com>
Cr-Commit-Position: refs/heads/master@{#55525}

This is no longer necessary as the JSFunction::code field is now a
proper tagged field, that points to a Code object, instead of a
naked pointer into the beginning of the Code object. So now the
representation selection always sees a proper tagged value here.

Bug: v8:8015
Change-Id: Ia66e9425d82a0f765e4cbb6e3bed7bcdd9438958
Reviewed-on: https://chromium-review.googlesource.com/1196662Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55524}

Since jump tables cannot be embedded, prevent their generation for
bytecode handlers. This allows the remaining 7 bytecode handlers to be
marked isolate independent.

Bug: v8:8068
Change-Id: I3a4a6e6530fd1c585558a0d44bd429f572318b57
Reviewed-on: https://chromium-review.googlesource.com/1196509Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55523}

Embedders should use the mentioned replacements.

Bug: chromium:843903
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I7b7d6a086fd5fe5df3b6d0c4a91bb834c699600d
Reviewed-on: https://chromium-review.googlesource.com/1196444Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55522}

This improves parse time for code-load and other benchmarks.

Bug: v8:7926
Change-Id: I9c8017f2e7f73dd952c025db5abe8e4062e6ef9b
Reviewed-on: https://chromium-review.googlesource.com/1196506
Commit-Queue: Florian Sattler <sattlerf@google.com>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55521}

This CL improves the performance of creating [...a, b] or [...a].
If the array literal has a leading spread, this CL emits the bytecode
[CreateArrayFromIterable] to create the literal. CreateArrayFromIterable
is implemented by [IterableToListDefault] builtin to create the initial
array for the leading spread. IterableToListDefault has a fast path to
clone efficiently if the spread is an actual array.

The bytecode generated is now shorter. Bytecode generation is refactored
into to BuildCreateArrayLiteral, which allows VisitCallSuper to benefit
from this optimization also.
For now, turbofan also lowers the bytecode to the builtin.

The idiomatic use of [...a] to clone the array a now performs better
than a simple for-loop, but still does not match the performance of slice.

Bug: v8:7980

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Change-Id: Ibde659c82d3c7aa1b1777a3d2f6426ac8cc15e35
Reviewed-on: https://chromium-review.googlesource.com/1181024Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Commit-Queue: Hai Dang <dhai@google.com>
Cr-Commit-Position: refs/heads/master@{#55520}

This is needed to meet the timeout requirements of android builds.

Change-Id: Ia771f94683e2e0c88c54ed0e0a75925abfa85786
Reviewed-on: https://chromium-review.googlesource.com/1196508Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Florian Sattler <sattlerf@google.com>
Cr-Commit-Position: refs/heads/master@{#55519}

This changes SimplifiedLowering to be more consistent when chosing Smi
representation as input for Number comparisons. We already had some
isolated logic for doing (speculative) Number comparisons on Smis, but
only in the case where that decision was based on type feedback, not on
information already present in the graph.

Bug: v8:7703
Change-Id: I25370ade630917675a6ac79b5ae6a8afd253dfc7
Reviewed-on: https://chromium-review.googlesource.com/1196422Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55518}

This removes the thread-local field in question. This side-channel for
the "caught exception" is not needed, we can just explicitly pass the
exception value to all support functions. Also, there is an inherent
problem with having this side-channel, as it will not be properly reset
when an exception handler ends up not rethrowing the exception.

R=ahaas@chromium.org
BUG=v8:8097

Change-Id: I2fdaff89f0eb318ce5a33bf56513165185547c1b
Reviewed-on: https://chromium-review.googlesource.com/1194063Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55517}

TBR=machenbach@chromium.org, hablich@chromium.org
NOTRY=true

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Change-Id: I8c5fc76a3d16428c2495c23ef0529569a927a8c9
Reviewed-on: https://chromium-review.googlesource.com/1196443
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55516}

This reverts two CLs that were intended to show symbols for embedded builtins in chromecrash. The symbols never showed up, a part of this must still be missing.

Revert "[builtins] Declare builtin symbols as globals"
This reverts commit 8412353c.

Revert "[builtins] Declare builtin symbols"
This reverts commit 17ad3ae4.

TBR=yangguo@chromium.org

Bug: v8:6666, v8:7722
Change-Id: Ifcbf56a36ea51ea65de77c507886402f3663f414
Reviewed-on: https://chromium-review.googlesource.com/1195493Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55515}

Use BuiltinAssemblerOptions to generate AssemblerOptions when generating
the bytecode handlers (assuming v8_enable_embedded_bytecode_handlers is
on).

Mark all but InvokeIntrinsic, InvokeIntrinsicWide,
InvokeIntrinsicExtraWide, TestIn, TestInWide, TestInExtraWide and
TestTypeOf as isolate-independent. The excluded handlers create jump
tables which have absolute addresses.

Bug: v8:8068
Change-Id: Ia29e9c737ec345193e24fc2aa3684daefb113a9a
Reviewed-on: https://chromium-review.googlesource.com/1195508Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55514}

This reverts commit 19a8f1ba.

Reason for revert: it's actually slower this way

Original change's description:
> [scanner] Use AdvanceUntil in SkipWhiteSpace
> 
> Change-Id: I4a578589290e91da2eae4cef8f936e6c888e177c
> Reviewed-on: https://chromium-review.googlesource.com/1194015
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Commit-Queue: Toon Verwaest <verwaest@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#55497}

TBR=ishell@chromium.org,verwaest@chromium.org

Change-Id: I93b51104bef984332536360c6321eaa1dab8fd74
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1196402Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55513}

Also takes care of InterpreterEnterBytecodeAdvance.

Drive-by:
 - Add DCHECK to ensure cmpb is only used with byte registers.
 - Add Push/PopRootRegister to TurboAssembler with DCHECK ensuring
   that there is a NoRootArrayScope


Change-Id: Ibcf1c91b12767bdf6425b18872c41b31124de3ba
Bug: v8:6666
Reviewed-on: https://chromium-review.googlesource.com/1190305Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55512}

Minor cleanup moving some types to more meaningful headers.

Bug: v8:8015
Change-Id: I99e428529f0b2d967a3c67385c80001bb0df19fa
Reviewed-on: https://chromium-review.googlesource.com/1195506Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Stephan Herhut <herhut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55511}

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Change-Id: I9adf2b15b76e26e6e59a7732da714da7d44daf69
Reviewed-on: https://chromium-review.googlesource.com/1195071Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55510}

This is a reland of e987606a

Original change's description:
> inspector: do not convert and store String16 for script source
>
> We need script source for:
> - calculating hash to report as part of scriptParsed event,
> - reporting it as response on getScriptSource request,
> - searching inside as response on searchInContent request,
> - breakpoints hints.
>
> In all cases there is no need to store source on inspector side.
>
> R=alph@chromium.org
>
> Bug: chromium:873865,v8:7731
> Cq-Include-Trybots: luci.chromium.try:linux_chromium_headless_rel;master.tryserver.blink:linux_trusty_blink_rel
> Change-Id: Ice24ddc72cfff36fb9a2dff2d7c4543defe3f668
> Reviewed-on: https://chromium-review.googlesource.com/1182603
> Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
> Reviewed-by: Alexei Filippov <alph@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#55286}

TBR=alph@chromium.org

Bug: chromium:873865, v8:7731
Change-Id: I0a0e93cd9d7797e4b3c57b1ab4f1a20af27fea9c
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Reviewed-on: https://chromium-review.googlesource.com/1195907Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55509}

Add a C++ helper function called "CreateBoundFunction" as a static
function to the Intl class, and change all existing builtins involving
the creation of a bound function to use it instead.

Also remove the redundant ContextSlot enums on all Intl objects in favor
of a single BoundFunctionContextSlot enum in the Intl class.

Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: Ibd541f5e79828cd1e2cd573a0e23fc93b348a8ad
Reviewed-on: https://chromium-review.googlesource.com/1194817
Commit-Queue: Ujjwal Sharma <usharma1998@gmail.com>
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55508}

This is a reland of 1b3b808a

Original change's description:
> inspector: find magic comment using V8 scanner
>
> Inspector tries to provide sourceURL and sourceMappingURL for scripts
> with parser errors. Without this CL we convert source of each script
> to inspector string and search for magic comment there. Some web sites
> use pattern when they get some data from network and constantly try to
> parse this data as JSON, in this case we do a lot of useless work.
>
> So we can parse magic comments on V8 side only for compilation errors
> (excluding parse JSON errors), to do it we can reuse scanner by running
> it on each potential comment.
>
> R=alph@chromium.org,verwaest@chromium.org,yangguo@chromium.org
>
> Bug: chromium:873865,v8:7731
> Cq-Include-Trybots: luci.chromium.try:linux_chromium_headless_rel;master.tryserver.blink:linux_trusty_blink_rel
> Change-Id: I77c270fd0e95cd7b2c9ee4b7f72ef344bc1fa104
> Reviewed-on: https://chromium-review.googlesource.com/1182446
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Reviewed-by: Alexei Filippov <alph@chromium.org>
> Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#55280}

TBR=alph@chromium.org,verwaest@chromium.org,yangguo@chromium.org

Bug: chromium:873865, v8:7731
Change-Id: I097678fda0ebdcbd35a85be0bb6cf0fcb052bcbd
Cq-Include-Trybots: luci.chromium.try:linux_chromium_headless_rel;master.tryserver.blink:linux_trusty_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/1195533
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55507}

Bug: v8:5537
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: I778ec7f1b09665bf15b208f5dfa6517c46e9e5d0
Reviewed-on: https://chromium-review.googlesource.com/1195536Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55506}

Bug: v8:7869
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: Idaa9ff1c5c46051aacaa2691e539484295622b8d
Reviewed-on: https://chromium-review.googlesource.com/1195076Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55505}

Change-Id: I07a95f70b32a065233df61110add3c71b85ec025
Reviewed-on: https://chromium-review.googlesource.com/1193895Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55504}