Port 306c412c

Original commit message:

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

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

BUG=v8:4261
LOG=N

Review-Url: https://codereview.chromium.org/1929703002
Cr-Commit-Position: refs/heads/master@{#35838}

Return the empty string from StringPad if the filler argument is the empty
string, effectively returning the string unchanged in StringPadStart and
StringPadEnd.

```
"foo".padStart(100000, "") -> "foo"
```

BUG=v8:4957, v8:4954
LOG=N
R=littledan@chromium.org

Review-Url: https://codereview.chromium.org/1926773003
Cr-Commit-Position: refs/heads/master@{#35837}

BUG=v8:4954
LOG=Y
R=littledan@chromium.org

Review-Url: https://codereview.chromium.org/1932453002
Cr-Commit-Position: refs/heads/master@{#35836}

The legacy function declaration locations from Annex B 3.2 and 3.4 do not
apply for generator declarations. This patch cracks down on those usages,
which is tested for by new incoming test262 tests.

BUG=v8:4824
LOG=Y
R=adamk

Review-Url: https://codereview.chromium.org/1900033003
Cr-Commit-Position: refs/heads/master@{#35835}

The status FAILED and BAILED_OUT only distinguishes between whether an
exception is pending or not. Such a distinction is obsolete by now as
all callers check for pending exceptions directly. Also it is impossible
for any concurrent part of the job to actually set a pending exception,
hence even the assertion that the concurrent part does not return FAILED
is obsolete.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/1926693003
Cr-Commit-Position: refs/heads/master@{#35834}

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

BUG=v8:4261
LOG=y

Review-Url: https://codereview.chromium.org/1910253005
Cr-Commit-Position: refs/heads/master@{#35833}

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/1925743002
Cr-Commit-Position: refs/heads/master@{#35832}

This moves the common code for allocating a compilation job into one
single place in the compilation pipeline. This will make it easier to
reason about involved lifetimes.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/1923293002
Cr-Commit-Position: refs/heads/master@{#35831}

Now that the GC team has landed the appropriate changes to ensure that the top
page of the address space is never used for allocation, the inlined fast-case
allocation path in the CodeAssembler can be micro-optimized to an add to top
followed by an unsigned compare to limit, eliding a no-longer-needed overflow
check.

Review-Url: https://codereview.chromium.org/1923803003
Cr-Commit-Position: refs/heads/master@{#35830}

Port ef49c6b1

Original commit message:

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

R=mlippautz@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=chromium:606711
LOG=N

Review-Url: https://codereview.chromium.org/1917353002
Cr-Commit-Position: refs/heads/master@{#35829}

This addresses Cortex-A53 errata 819472, 826319, 827319 and 824069.

Note that using "civac" rather than "cvau" doesn't appear to affect
performance at all.

BUG=

Review-Url: https://codereview.chromium.org/1921173004
Cr-Commit-Position: refs/heads/master@{#35828}

This makes sure that the testing pipeline withing the FunctionTester
class only performs AST analysis and deoptimization preparation when
graphs are generated from the AST (as opposed to from bytecode).

R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/1928523002
Cr-Commit-Position: refs/heads/master@{#35827}

Useful for inspecting constant fields in objects.

BUG=
R=machenbach

Review-Url: https://codereview.chromium.org/1922903003
Cr-Commit-Position: refs/heads/master@{#35826}

BUG=chromium:605349
LOG=NO

Review URL: https://codereview.chromium.org/1921213004

Cr-Commit-Position: refs/heads/master@{#35825}

Trace-opt/trace-deopt output is ambiguous if multiple functions share
the same name. This change adds file names to this output behind the
--trace-file-names flag to reduce this ambiguity.

R=ofrobots@google.com
BUG=

Review URL: https://codereview.chromium.org/1920873003

Cr-Commit-Position: refs/heads/master@{#35824}

BUG=

Review URL: https://codereview.chromium.org/1926493003

Cr-Commit-Position: refs/heads/master@{#35823}

BUG=v8:4915
LOG=Y

Review URL: https://codereview.chromium.org/1914423002

Cr-Commit-Position: refs/heads/master@{#35822}

The change removes threading information from the JSON debug API, which
is deprecated anyways.

R=cbruni@chromium.org

Review URL: https://codereview.chromium.org/1924743002

Cr-Commit-Position: refs/heads/master@{#35821}

This is necessary to eventually build a turbofan graph.

BUG=v8:4907
LOG=n

Review URL: https://codereview.chromium.org/1901713003

Cr-Commit-Position: refs/heads/master@{#35820}

Revert of [heap] Uncommit pooled pages concurrently (patchset #5 id:120001 of https://codereview.chromium.org/1913083002/ )

Reason for revert:
Creates a spike of OOM(v8) crashers on Win32.

Original issue's description:
> [heap] Uncommit pooled pages concurrently
>
> - Move the concurrent unmapping to MemoryAllocator
> - Hide (private) members where possible
> - MemoryAllocator:Free is now the bottleneck for freeing
> - Pooled pages are either allocated from a set of pooled pages are obtained
>   through work stealing from the concurrent unmapper
>
> BUG=chromium:605866, chromium:581412
> LOG=N
>
> Committed: https://crrev.com/2158df87116906160cebc3ad20c97f454822da03
> Cr-Commit-Position: refs/heads/master@{#35797}

TBR=hpayer@chromium.org,mlippautz@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:605866, chromium:581412

Review URL: https://codereview.chromium.org/1925563003

Cr-Commit-Position: refs/heads/master@{#35819}

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.

R=mstarzinger@chromium.org, ahaas@chromium.org, jarin@chromium.org

Review URL: https://codereview.chromium.org/1179393008

Cr-Commit-Position: refs/heads/master@{#35818}

Uses now the same location chromium uses and which some tools
expect.

BUG=chromium:474921
LOG=n

Review URL: https://codereview.chromium.org/1929473002

Cr-Commit-Position: refs/heads/master@{#35817}

This commit introduces IgnitionStatisticsExtension, which provides
methods for accessing Ignition statistics and counters from JavaScript.

The extension is registered when FLAG_ignition and
FLAG_trace_ignition_dispatches are both enabled.

For the moment, the only exposed function is
getIgnitionDispatchCounters(), which allows to retrieve Ignition
dispatch counters as a JavaScript object.

BUG=v8:4899
LOG=N

Review URL: https://codereview.chromium.org/1899133004

Cr-Commit-Position: refs/heads/master@{#35816}

Revert of [debugger] unskip mjsunit/debug-stepin-builtin-callback-opt. (patchset #1 id:1 of https://codereview.chromium.org/1927543002/ )

Reason for revert:
Now we do have a repro!

https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20gc%20stress/builds/3187/steps/Mjsunit%20-%20ignition%20-%20turbofan/logs/debug-stepin-builtin-..

Original issue's description:
> [debugger] unskip mjsunit/debug-stepin-builtin-callback-opt.
>
> This test does not seem to fail any longer.
>
> R=machenbach@chromium.org
> BUG=v8:4690
> LOG=N
>
> Committed: https://crrev.com/f8e44fb5aaaa80cf2d39bc3164f2c962a6b57f5e
> Cr-Commit-Position: refs/heads/master@{#35814}

TBR=machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4690

Review URL: https://codereview.chromium.org/1931433002

Cr-Commit-Position: refs/heads/master@{#35815}

This test does not seem to fail any longer.

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

Review URL: https://codereview.chromium.org/1927543002

Cr-Commit-Position: refs/heads/master@{#35814}

BUG=v8:4698
LOG=N

Review URL: https://codereview.chromium.org/1914393002

Cr-Commit-Position: refs/heads/master@{#35813}

This has moved to src/v8.gyp in:
https://codereview.chromium.org/1920793002/

BUG=chromium:474921
LOG=n
NOTRY=true

Review URL: https://codereview.chromium.org/1927513002

Cr-Commit-Position: refs/heads/master@{#35812}

Between the miss and patching, we run user code. That may already patch the same code. IC refactoring broke this (again), so including a regression test this time around.

BUG=chromium:601392
LOG=n

Review URL: https://codereview.chromium.org/1925583002

Cr-Commit-Position: refs/heads/master@{#35811}

Review URL: https://codereview.chromium.org/1922413002

Cr-Commit-Position: refs/heads/master@{#35810}

To land and test wrapper tracing incrementally, we will use both, and parts
which are expected to work with the tracing will be removed from
V8GCController's handle visiting.

LOG=no
BUG=468240

Review URL: https://codereview.chromium.org/1925573002

Cr-Commit-Position: refs/heads/master@{#35809}

  port ef49c6b1 (r35792)

  original commit message:
  Default (and only way) is now to retrieve a tagged object.

BUG=

Review URL: https://codereview.chromium.org/1924643004

Cr-Commit-Position: refs/heads/master@{#35808}

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1919263002

Cr-Commit-Position: refs/heads/master@{#35807}

Otherwise property lookups would also travel up the prototype chain, which makes no sense for the debugger use case.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1928463002

Cr-Commit-Position: refs/heads/master@{#35806}

R=bmeurer@chromium.org, kozyatinskiy@chromium.org
BUG=chromium:582048
LOG=N

Review URL: https://codereview.chromium.org/1916343002

Cr-Commit-Position: refs/heads/master@{#35805}

Review URL: https://codereview.chromium.org/1920883003

Cr-Commit-Position: refs/heads/master@{#35804}

Port c005029a

Original commit message:

    Use the FastNewSloppyArgumentsStub in the interpreter when function doesn't have
    duplicate parameters.

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

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1924483002

Cr-Commit-Position: refs/heads/master@{#35803}

Port 0231a7ef

Original commit message:

    This allows us to get rid of the "push TruncateFloat64ToInt32 into Phi"
    trick that was used in the MachineOperatorReducer to combine the
    ChangeTaggedToFloat64 and TruncateFloat64ToInt32 operations. Instead of
    doing that later, we can just introduce the proper operator during the
    representation selection directly.

    Also separate the TruncateFloat64ToInt32 machine operator, which had two
    different meanings depending on a flag (either JavaScript truncation or
    C++ style round to zero). Now there's a TruncateFloat64ToWord32 which
    represents the JavaScript truncation (implemented via TruncateDoubleToI
    macro + code stub) and the RoundFloat64ToInt32, which implements the C++
    round towards zero operation (in the same style as the other WebAssembly
    driven Round* machine operators).

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

BUG=
LOG=N

Review URL: https://codereview.chromium.org/1922183002

Cr-Commit-Position: refs/heads/master@{#35802}

The double register phase will eventually handle single, double, and
SIMD registers. Change enum and class names to reflect this.

LOG=N
BUG=v8:4124

Review URL: https://codereview.chromium.org/1544603002

Cr-Commit-Position: refs/heads/master@{#35801}

This patch ensures that the species protector does not cause
any slow paths to be taken when --harmony-species is off by
refraining from writing to and reading from the protector
when the flag is off.

BUG=chromium:606207
R=adamk
LOG=Y

Review URL: https://codereview.chromium.org/1918383002

Cr-Commit-Position: refs/heads/master@{#35800}

The syntax is "return continue expr;".

BUG=v8:4915
LOG=Y

Review URL: https://codereview.chromium.org/1917993004

Cr-Commit-Position: refs/heads/master@{#35799}