Revert of [turbofan][arm64] Match fneg for -0.0 - x pattern. (patchset #1 id:1 of https://codereview.chromium.org/1013743006/)

Reason for revert:
Revert due to crash.

Original issue's description:
> [turbofan][arm64] Match fneg for -0.0 - x pattern.
>
> Note that this patch add an extra bit to the ArchOpcodeField.
>
> R=bmeurer@chromium.org
>
> Committed: https://crrev.com/fe7441225100660d01e66ce3bcaefe368f62df81
> Cr-Commit-Position: refs/heads/master@{#27494}

TBR=bmeurer@chromium.org,baptiste.afsa@arm.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1041633002

Cr-Commit-Position: refs/heads/master@{#27495}

Note that this patch add an extra bit to the ArchOpcodeField.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1013743006

Cr-Commit-Position: refs/heads/master@{#27494}

The current GC idle time handling heuristics are getting too complicated. Moreover, with longer idle time we are getting more full garbage collections. This CL shrinks the idle round window and reduces complexity in the case where we cause a full garbage collection.

BUG=chromium:468554
LOG=n

Review URL: https://codereview.chromium.org/1024043003

Cr-Commit-Position: refs/heads/master@{#27493}

BUG=

Review URL: https://codereview.chromium.org/1039153002

Cr-Commit-Position: refs/heads/master@{#27492}

Revert of Reland "Filter invalid slots out from the SlotsBuffer after marking." (patchset #2 id:2 of https://codereview.chromium.org/1032833002/)

Reason for revert:
Reverting risky GC changes that block v8 roll.

Original issue's description:
> Reland "Filter invalid slots out from the SlotsBuffer after marking."
>
> > There are two reasons that could cause invalid slots appearance in SlotsBuffer:
> > 1) If GC trims "tail" of an array for which it has already recorded a slots and then migrate another object to the "tail".
> > 2) Tagged slot could become a double slot after migrating of an object to another map with "shifted" fields (for example as a result of generalizing immutable data property to a data field).
>
> > This CL also adds useful machinery that helps triggering incremental write barriers.
>
> > BUG=chromium:454297
> > LOG=Y
>
> NOTRY=true
>
> Committed: https://crrev.com/f86aadd1d45c756467dff8e08a055b462d7a060b
> Cr-Commit-Position: refs/heads/master@{#27433}

TBR=machenbach@chromium.org,ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1041593002

Cr-Commit-Position: refs/heads/master@{#27491}

Revert of Use a slot that is located on a heap page when removing invalid entries from the SlotsBuffer. (patchset #1 id:1 of https://codereview.chromium.org/1020853022/)

Reason for revert:
Reverting risky GC changes that block v8 roll.

Original issue's description:
> Use a slot that is located on a heap page when removing invalid entries from the SlotsBuffer.
>
> BUG=chromium:470801
> LOG=Y
>
> Committed: https://crrev.com/2f3a42f9a1d66ffc9d260d9700ff831c3aa1cd41
> Cr-Commit-Position: refs/heads/master@{#27467}

TBR=hpayer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:470801

Review URL: https://codereview.chromium.org/1033163002

Cr-Commit-Position: refs/heads/master@{#27490}

Use 64-bit load.

BUG=

Review URL: https://codereview.chromium.org/1037863003

Cr-Commit-Position: refs/heads/master@{#27489}

Fixes these tests in PPC,debug,non-sim

mjsunit/compiler/osr-maze1
mjsunit/compiler/regress-3
mjsunit/regress/regress-crbug-173907
mjsunit/regress/regress-crbug-173907b

R=mbrandy@us.ibm.com

BUG=

Review URL: https://codereview.chromium.org/1038923003

Cr-Commit-Position: refs/heads/master@{#27488}

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1034153003

Cr-Commit-Position: refs/heads/master@{#27487}

Port ebc51674

Original commit message:

R=mbrandy@us.ibm.com

BUG=

Review URL: https://codereview.chromium.org/1016003005

Cr-Commit-Position: refs/heads/master@{#27486}

R=ulan@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1032373002

Cr-Commit-Position: refs/heads/master@{#27485}

  This change comes from a6940f7a.

BUG=

Review URL: https://codereview.chromium.org/1031253005

Cr-Commit-Position: refs/heads/master@{#27484}

This reverts commit 89ba65fd.

Reason: crash in v8.detached_context_age_in_gc benchmark.

BUG=chromium:450824
LOG=NO
NOTRY=true
NOTREECHECKS=true
TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1034203002

Cr-Commit-Position: refs/heads/master@{#27483}

R=verwaest@chromium.org
BUG=468451
LOG=N

Review URL: https://codereview.chromium.org/1036743004

Cr-Commit-Position: refs/heads/master@{#27482}

The aforementioned predicate reported a JSFunction that was marked for
optimization as already compiled. This in turn also prevented us from
being aggressive about FLAG_always_opt treatment.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1019293003

Cr-Commit-Position: refs/heads/master@{#27481}

BUG=

Review URL: https://codereview.chromium.org/1019923004

Cr-Commit-Position: refs/heads/master@{#27480}

We want to verify that we always overwrite heap objects with heap
objects, and non-heap objects with non-heap objects

BUG=chromium:452095
R=hpayer@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1035763002

Cr-Commit-Position: refs/heads/master@{#27479}

port 38a719f9  (r27440)

original commit message:

    This switches full-codegen to no longer push and pop StackHandler
    markers onto the operand stack, but relies on a range-based handler
    table instead. We only use StackHandlers in JSEntryStubs to mark the
    transition from C to JS code.

    Note that this makes deoptimization and OSR from within any try-block
    work out of the box, makes the non-exception paths faster and should
    overall be neutral on the memory footprint (pros).

    On the other hand it makes the exception paths slower and actually
    throwing and exception more expensive (cons).

BUG=

Review URL: https://codereview.chromium.org/1030283003

Cr-Commit-Position: refs/heads/master@{#27478}

Only one FrameInspector can be active at a time on any given stack,
this ensures that it's lifetime is sufficiently scoped.

R=yangguo@chromium.org
TEST=mjsunit/regress/regress-crbug-259300

Review URL: https://codereview.chromium.org/1034743002

Cr-Commit-Position: refs/heads/master@{#27477}

BUG=none
R=hpayer@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1032963002

Cr-Commit-Position: refs/heads/master@{#27476}

R=jochen@chromium.org, erikcorry@chromium.org

BUG=

Review URL: https://codereview.chromium.org/998253006

Cr-Commit-Position: refs/heads/master@{#27475}

This variant avoids a constant pool entry, which can be problematic
when LTO'ing. It is also slightly shorter.

R=bmeurer@chromium.org,Jacob.Bramley@arm.com
BUG=chromium:453195
LOG=n

Review URL: https://codereview.chromium.org/986643004

Cr-Commit-Position: refs/heads/master@{#27474}

Instead of CanRetainOtherContext, we now manually blacklist all access-checked objects.

BUG=

Review URL: https://codereview.chromium.org/1020803004

Cr-Commit-Position: refs/heads/master@{#27473}

Revert of Revert of Debugger: deduplicate shared function info when setting script break points. (patchset #1 id:1 of https://codereview.chromium.org/999273003/)

Reason for revert:
Reland since the failure has been fixed in https://codereview.chromium.org/1035523005/

Original issue's description:
> Revert of Debugger: deduplicate shared function info when setting script break points. (patchset #4 id:60001 of https://codereview.chromium.org/998253005/)
>
> Reason for revert:
> Code caching failures.
>
> Original issue's description:
> > Debugger: deduplicate shared function info when setting script break points.
> >
> > Also fix Debug.showBreakPoints for multiple break points at the same location.
> >
> > BUG=v8:3960
> > LOG=N
> >
> > Committed: https://crrev.com/73b17a71a22564c0b66d9aa7c00948c748f5b290
> > Cr-Commit-Position: refs/heads/master@{#27444}
>
> TBR=mstarzinger@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:3960
>
> Committed: https://crrev.com/9b29d008dfcc00bf56be8040add1d2c5e404673b
> Cr-Commit-Position: refs/heads/master@{#27448}

TBR=mstarzinger@chromium.org
BUG=v8:3960
LOG=N

Review URL: https://codereview.chromium.org/1037013002

Cr-Commit-Position: refs/heads/master@{#27472}

R=jochen@chromium.org

Review URL: https://codereview.chromium.org/1035523005

Cr-Commit-Position: refs/heads/master@{#27471}

BUG=

Review URL: https://codereview.chromium.org/1021713005

Cr-Commit-Position: refs/heads/master@{#27470}

R=jarin@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1037913002

Cr-Commit-Position: refs/heads/master@{#27469}

R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1019803005

Cr-Commit-Position: refs/heads/master@{#27468}

BUG=chromium:470801
LOG=Y

Review URL: https://codereview.chromium.org/1020853022

Cr-Commit-Position: refs/heads/master@{#27467}

Before this patch the embedder could assign timestamp to the last interval after calling GetHeapStats. This would be slightly different from the timstamps assigned by v8 internally and written into heap snapshot. This patch allow to avoid this small discrepancy by returning timestamp along with last heap stats update.

BUG=chromium:467222
LOG=Y

Review URL: https://codereview.chromium.org/1037803002

Cr-Commit-Position: refs/heads/master@{#27466}

LOG=n

Review URL: https://codereview.chromium.org/1013753016

Cr-Commit-Position: refs/heads/master@{#27465}

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/1005053004

Cr-Commit-Position: refs/heads/master@{#27464}

The value returned on AIX for platform.machine() is not the
best value to map the architecture from.  Use platform.system
to determine if we are on AIX and if so set host_arch to
ppc64 as AIX 6.1 (the earliest supported) only provides a
64 bit kernel

AIX was reporting warning that offset may be used uninitialized

	modified:   build/detect_v8_host_arch.py
	modified:   build/standalone.gypi
	modified:   src/hydrogen-bce.cc

R=mbrandy@us.ibm.com, jkummerow@chromium.org

BUG=

Review URL: https://codereview.chromium.org/1006583004

Cr-Commit-Position: refs/heads/master@{#27463}

Rolling v8/tools/clang to ea2f0a2d96ffc6f5a51c034db704ccc1a6543156

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1032223004

Cr-Commit-Position: refs/heads/master@{#27462}

port 6689cc27 (r27377)

original commit message:

    Handlers should be in charge of this work. The change uncovered a bug in
    vector-ics related to keyed loads into strings. It's important for
    StringCharCodeAtGenerator, a helper used in full code and in
    LoadIndexedStringStub (a handler) to protect the vector and slot registers
    when it makes a runtime call to convert a HeapNumber to a Smi.

    It's still possible for the handler to MISS after this call, perhaps due
    to out of bounds access. In that case, the vector and slot registers need
    to be delivered safely to the MISS handler.

BUG=

Review URL: https://codereview.chromium.org/1033733005

Cr-Commit-Position: refs/heads/master@{#27461}

port d21fd154 (r27316)

original commit message:

  [es6] implement Reflect.apply() & Reflect.construct()

BUG=

Review URL: https://codereview.chromium.org/1021723006

Cr-Commit-Position: refs/heads/master@{#27460}

port bef80fcf (r27344)

  original commit message:

     [es6] generate rest parameters correctly for subclass constructors

BUG=

Review URL: https://codereview.chromium.org/1033643002

Cr-Commit-Position: refs/heads/master@{#27459}

This method uses in messages.js in GetSourceLine and GetPositionInLine. This methods uses in v8::Message API methods and there is no documentation about it.
Method looks obsolete.
One of the strange side effect is shown by attached issue.

BUG=chromium:468781
TBR=yangguo@chromium.org
LOG=Y

Review URL: https://codereview.chromium.org/1033973002

Cr-Commit-Position: refs/heads/master@{#27458}

Revert of add access checks to receivers on function callbacks (patchset #5 id:80001 of https://codereview.chromium.org/1036743004/)

Reason for revert:
This seems to lead to lots of timeouts of layout tests, e.g.:
http://build.chromium.org/p/client.v8/builders/V8-Blink%20Linux%2064/builds/2807

Original issue's description:
> add access checks to receivers on function callbacks
>
> R=verwaest@chromium.org
> BUG=468451
> LOG=N
>
> Committed: https://crrev.com/255528710b0a128eef7b66827d9ac43e44650ff4
> Cr-Commit-Position: refs/heads/master@{#27452}

TBR=verwaest@chromium.org,dcarney@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=468451

Review URL: https://codereview.chromium.org/1023783009

Cr-Commit-Position: refs/heads/master@{#27457}

This fixes warnings on some compilers.

BUG=

Review URL: https://codereview.chromium.org/1038623002

Cr-Commit-Position: refs/heads/master@{#27456}