Revert of Avoid Context::Enter and Context::Exit if we're reentering the active and last entered context (patchset #2 id:20001 of https://codereview.chromium.org/2131483002/ )

Reason for revert:
crashes: crbug.com/626719

Original issue's description:
> Avoid Context::Enter and Context::Exit if we're reentering the active and last entered context
>
> A bit of browsing around indicates that the new fast-path is taken most of the time:
>    3496 Entering new
>  152295 Reentering same
>
> BUG=
>
> Committed: https://crrev.com/1829eb661ef1cf432fb551bcb193f521a219d490
> Cr-Commit-Position: refs/heads/master@{#37570}

TBR=jochen@chromium.org,verwaest@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Review-Url: https://codereview.chromium.org/2140563002
Cr-Commit-Position: refs/heads/master@{#37632}

CallSite::IsConstructor() was unable to recognize builtin construct stubs
(NumberConstructor_ConstructStub and StringConstructor_ConstructStub) as
constructors, and thus these frames were not formatted correctly in stack
traces.

Fix this by explicitly marking their Code objects as construct stubs and
passing along a special receiver value when we encounter such cases in
CaptureSimpleStackTrace.

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

Review-Url: https://codereview.chromium.org/2125163004
Cr-Commit-Position: refs/heads/master@{#37631}

If a Smi field load is truncated to Word32, we can just load the upper
32 bits on 64-bit architectures (with 32-bit Smis), which avoids the
nasty shift right that we'd have to perform otherwise to untag it.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2140553002
Cr-Commit-Position: refs/heads/master@{#37630}

Usually loops run from 0 to some array length l, which means the
induction variable i will probably have type Unsigned32, just like
the length l. The CheckBounds operation lowers to an Uint32LessThan
comparison, so if we also lower the user level i < l comparison to
Uint32LessThan (whenever possible), we get some bounds check elimination
for free (via value numbering plus branch condition elimination).

This merges the branch condition elimination phase with the late
optimization phase to make this magic happen.

R=jarin@chromium.org
BUG=v8:4930,v8:5141

Review-Url: https://codereview.chromium.org/2135123002
Cr-Commit-Position: refs/heads/master@{#37629}

This enables tests which verify allocation site feedback is used and
influences pretenuring decisions. By now TurboFan is respecting such
feedback. Ignition however doesn't provide such feedback yet.

R=mvstanton@chromium.org

Review-Url: https://codereview.chromium.org/2135563003
Cr-Commit-Position: refs/heads/master@{#37628}

This change analyzes and links the output of --code-comments in the disassembly view within turbolizer with the other views, such that selecting these comments will also select the respective blocks/lines/nodes within the other views. The block start comments (e.g. -- B4 start --) are linked with the blocks in the schedule phase view and vice versa. The source position comments (e.g. -- primes.js:3:10 --) select the respective spans, lines, and nodes in the JavaScript code view, the schedule phase view, and the other compilation phase views respectively, and vice versa. It also modifies the display of the line and column numbers in the source position comments to be offset from 1 instead of 0 and ignore the initial source position of the first line of code (from removal of the function name in the compiler).

Also fixed the bug where previous selections weren't being cleared properly across multiple views, adding appropriate clear calls when using the selection broker.

Review-Url: https://codereview.chromium.org/2133663002
Cr-Commit-Position: refs/heads/master@{#37627}

Revert "Move SimulatorHelper into V8 out of profiler clients."

This reverts commit b8372411.

Revert "Make use of v8::TickSample instead of v8::internal::TickSample in logger."

This reverts commit c3a16f0a.

Revert "Clean up SimulatorHelper code."

This reverts commit 8ee236e1.

BUG=v8:5193
TBR=alph@chromium.org, yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2138643003
Cr-Commit-Position: refs/heads/master@{#37626}

Enable the same checks for builtin exit frames as are used for all other
standard (i.e. non-wasm) types, and refactor them into a single helper
class.

R=yangguo@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2135593002
Cr-Commit-Position: refs/heads/master@{#37625}

Reland of [gn] Switch gcc bots to gn (patchset #1 id:1 of https://codereview.chromium.org/2130303002/ )

Reason for revert:
Relanding as the goma problem is due to an upgrade of the binutils version we use.

Original issue's description:
> Revert of [gn] Switch gcc bots to gn (patchset #3 id:40001 of https://codereview.chromium.org/2124263002/ )
>
> Reason for revert:
> There are a bunch of goma errors on the gcc bot now. Maybe connected to this CL.
>
> https://build.chromium.org/p/tryserver.v8/builders/v8_linux_gcc_compile_rel/builds/19068
>
> Original issue's description:
> > [gn] Switch gcc bots to gn
> >
> > BUG=chromium:474921
> >
> > Committed: https://crrev.com/73f154ba601dc70c4007968fa902d4beacba4393
> > Cr-Commit-Position: refs/heads/master@{#37580}
>
> TBR=vogelheim@chromium.org,jochen@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=chromium:474921
>
> Committed: https://crrev.com/980d0d6e227f8de3cc0b71a0d3f492908adcf138
> Cr-Commit-Position: refs/heads/master@{#37603}

TBR=vogelheim@chromium.org,jochen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:474921
NOTRY=true

Review-Url: https://codereview.chromium.org/2132333002
Cr-Commit-Position: refs/heads/master@{#37624}

R=bmeurer@chromium.org, littledan@chromium.org
BUG=v8:5167

Review-Url: https://codereview.chromium.org/2124813002
Cr-Commit-Position: refs/heads/master@{#37623}

  port d49d3864 (r37598)

  original commit message:

BUG=

Review-Url: https://codereview.chromium.org/2132303002
Cr-Commit-Position: refs/heads/master@{#37622}

Consume Smi/Signed32 feedback for division and modulus and introduce
appropriate checked operators. This is especially important for modulus
where the Float64Mod operator is significantly slower than Int32Mod on
most platforms. For division it's mostly important to propagate
integerness, i.e. to avoid follow-up conversions between float and
int32.

Drive-by-fix: Use Int32Mod for the ModulusStub (and the bytecode handler)
when the inputs are both Smi.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2138633002
Cr-Commit-Position: refs/heads/master@{#37621}

Rolling v8/build to 766297ee7fd0da3d95276a02ff11089ec3aced9b

Rolling v8/tools/clang to 29e654f4a3d0fa9c7c69f2967d427ccbd6f4d4c8

Rolling v8/tools/mb to c279952c34ea262021767ad1f2087f988d85881c

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

Review-Url: https://codereview.chromium.org/2136463003
Cr-Commit-Position: refs/heads/master@{#37620}

Review-Url: https://codereview.chromium.org/2131643003
Cr-Commit-Position: refs/heads/master@{#37619}

BUG=v8:4789

Review-Url: https://codereview.chromium.org/2133533002
Cr-Commit-Position: refs/heads/master@{#37618}

Clients should not know about the simulator.

BUG=v8:4789

Review-Url: https://codereview.chromium.org/2128613004
Cr-Commit-Position: refs/heads/master@{#37617}

BUG=chromium:617761
NOTRY=true

Review-Url: https://codereview.chromium.org/2113453007
Cr-Commit-Position: refs/heads/master@{#37616}

The Intl code previously called the initial value of String.prototype.split
for some internal operations. However, this did not have the intended effect
as Intl only needs to split strings by strings, but String.prototype.split
has integration with Symbol.split for RegExps.

This patch replaces the calls of StringSplit in the Intl implementation
with direct calls to the %StringSplit runtime function to avoid the issue.

R=yangguo@chromium.org
BUG=v8:5179

Review-Url: https://codereview.chromium.org/2126073002
Cr-Commit-Position: refs/heads/master@{#37615}

Since Linux 4.1, flag -f became -F, but the long option --flags stayed
the same. Using --flags assures compatibility with new and old versions.

Also, symbols appear to be reported as name+offset in newer versions
even when not requested, so we trim the latter part if present.

BUG=v8:4899
LOG=N

Review-Url: https://codereview.chromium.org/2134703002
Cr-Commit-Position: refs/heads/master@{#37614}

Isolate is not going to retain a CPU profiler.
The client will be creating an instance of profiler when needed.

Deprectate v8::Isolate::GetCpuProfiler()

BUG=v8:4789

Review-Url: https://codereview.chromium.org/2117343006
Cr-Commit-Position: refs/heads/master@{#37613}

Revert of MIPS: [turbofan] Fix addition for deoptimization. (patchset #3 id:40001 of https://codereview.chromium.org/2102063002/ )

Reason for revert:
This workaround is no longer needed, port of e60c4053 fixes the issue.

Original issue's description:
> MIPS: [turbofan] Fix addition for deoptimization.
>
> In turbofan, after an addition operation where the same register is the
> output and both inputs, if deoptimization is performed the input is
> overwritten with the output value and the final result is not correct.
> This is fixed by restoring the original value of the input before
> deoptimization.
>
> BUG=
> TEST=mjsunit/regress/regress-int32-truncation
>
> Committed: https://crrev.com/99385e8e4bcef1f333ede61c936528bfc0c8ecfa
> Cr-Commit-Position: refs/heads/master@{#37524}

TBR=akos.palfi@imgtec.com,balazs.kilvady@imgtec.com,ivica.bogosavljevic@imgtec.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Review-Url: https://codereview.chromium.org/2129083003
Cr-Commit-Position: refs/heads/master@{#37612}

R=ahaas@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2130293002
Cr-Commit-Position: refs/heads/master@{#37611}

Port e60c4053

        this fix applies to mips as well.

BUG=
TEST=mjsunit/regress/regress-int32-truncation

Review-Url: https://codereview.chromium.org/2133503004
Cr-Commit-Position: refs/heads/master@{#37610}

R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2127423002
Cr-Commit-Position: refs/heads/master@{#37609}

This removes the frame state input representing the before-state from
nodes having the {JSDivide} or the {JSModulus} operator. Lowering that
inserts number conversions of the inputs has to be disabled when
deoptimization is enabled, because the frame state layout is no longer
known.

R=jarin@chromium.org
BUG=v8:5021

Review-Url: https://codereview.chromium.org/2121153003
Cr-Commit-Position: refs/heads/master@{#37608}

This CL is on the way to extend parallel compilation of wasm modules to code generation. With parallel compilation it is not allowed to dereference handles during code generation. However, the is_identical_to check dereferences handles. In this CL we therefore replace the call to is_identical_to with a handle comparison.

Review-Url: https://codereview.chromium.org/2109143002
Cr-Commit-Position: refs/heads/master@{#37607}

BUG=chromium:626622
NOTRY=true
NOPRESUBMIT=true
TBR=sergiyb@chromium.org

Review-Url: https://codereview.chromium.org/2136443004
Cr-Commit-Position: refs/heads/master@{#37606}

BUG=chromium:626622
NOTRY=true
TBR=sergiyb@chromium.org

Review-Url: https://codereview.chromium.org/2134643002
Cr-Commit-Position: refs/heads/master@{#37605}

This enables tests which rely on the context available at "debugger"
statements to be accurate. This is the case by now when deoptimization
information is available.

R=yangguo@chromium.org
BUG=v8:4055

Review URL: https://codereview.chromium.org/2129123002 .

Cr-Commit-Position: refs/heads/master@{#37604}

Revert of [gn] Switch gcc bots to gn (patchset #3 id:40001 of https://codereview.chromium.org/2124263002/ )

Reason for revert:
There are a bunch of goma errors on the gcc bot now. Maybe connected to this CL.

https://build.chromium.org/p/tryserver.v8/builders/v8_linux_gcc_compile_rel/builds/19068

Original issue's description:
> [gn] Switch gcc bots to gn
>
> BUG=chromium:474921
>
> Committed: https://crrev.com/73f154ba601dc70c4007968fa902d4beacba4393
> Cr-Commit-Position: refs/heads/master@{#37580}

TBR=vogelheim@chromium.org,jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:474921

Review-Url: https://codereview.chromium.org/2130303002
Cr-Commit-Position: refs/heads/master@{#37603}

R=bmeurer@chromium.org, mstarzinger@chromium.org, rmcilroy@chromium.org

Review-Url: https://codereview.chromium.org/2112853002
Cr-Commit-Position: refs/heads/master@{#37602}

Handles are necessary in wasm::GetDebugInfo because a GC can be
triggered in this function.

R=titzer@chromium.org, mstarzinger@chromium.org

Review-Url: https://codereview.chromium.org/2132553002
Cr-Commit-Position: refs/heads/master@{#37601}

BUG=

Review-Url: https://codereview.chromium.org/2126423002
Cr-Commit-Position: refs/heads/master@{#37600}

BUG=

Review-Url: https://codereview.chromium.org/2125023004
Cr-Commit-Position: refs/heads/master@{#37599}

BUG=v8:5173
R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2118283003
Cr-Commit-Position: refs/heads/master@{#37598}

Fix a TypeError when putting together the invocationText for a symbol
method's stack frame.

See https://github.com/nodejs/node/issues/7536.

Review-Url: https://codereview.chromium.org/2122793003
Cr-Commit-Position: refs/heads/master@{#37597}

Reland of [esnext] ship --harmony-object-values-entries (patchset #1 id:1 of https://codereview.chromium.org/2129533004/ )

Reason for revert:
Performance stayed the same after the revert; relanding.

Original issue's description:
> Revert of [esnext] ship --harmony-object-values-entries (patchset #1 id:1 of https://codereview.chromium.org/2116053003/ )
>
> Reason for revert:
> Revert to see if it addresses the performance regression observed in chromium:625956 in automated graphs
>
> Original issue's description:
> > [esnext] ship --harmony-object-values-entries
> >
> > BUG=v8:4663
> > R=littledan@chromium.org, adamk@chromium.org
> >
> > Committed: https://crrev.com/ab529234853a1768642f8f6c907aaaa5ea8b19bf
> > Cr-Commit-Position: refs/heads/master@{#37485}
>
> TBR=adamk@chromium.org,caitpotter88@gmail.com
> # Not skipping CQ checks because original CL landed more than 1 days ago.
> BUG=v8:4663
>
> Committed: https://crrev.com/1177750a98faaa11e92ece13b70115bf704baf3b
> Cr-Commit-Position: refs/heads/master@{#37566}

TBR=adamk@chromium.org,caitpotter88@gmail.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4663

Review-Url: https://codereview.chromium.org/2127253002
Cr-Commit-Position: refs/heads/master@{#37596}

Drive-by-fix: hydrogen code does not blindly return the
byteLength offset, instead it executes what is defined
in the byteLength getter.

BUG=

Review-Url: https://codereview.chromium.org/2123263002
Cr-Commit-Position: refs/heads/master@{#37595}

Such an object can be used to later create a context from it. It has to
have access checks with handlers enabled, as it cannot be accessed
otherwise.

BUG=chromium:618305
R=verwaest@chromium.org

Review-Url: https://codereview.chromium.org/2107673003
Cr-Commit-Position: refs/heads/master@{#37594}

BUG=chromium:474921
NOTRY=true
TBR=vogelheim@chromium.org, jochen@chromium.org, tandrii@chromium.org

Review-Url: https://codereview.chromium.org/2126793004
Cr-Commit-Position: refs/heads/master@{#37593}