Perform strength reduction on machine operators with inline comparisons:

  CMP & 1 => CMP
  1 & CMP => CMP
  CMP << 31 >> 31 => CMP

Also strength reduce the following constructs:

  x + (0 - y) => x - y
  (0 - y) + x => x - y

R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/951903003

Cr-Commit-Position: refs/heads/master@{#26817}

R=bmeurer@chromium.org
TEST=unittests/SchedulerTest.CallException

Review URL: https://codereview.chromium.org/944903002

Cr-Commit-Position: refs/heads/master@{#26816}

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/946073003

Cr-Commit-Position: refs/heads/master@{#26815}

BUG=

Review URL: https://codereview.chromium.org/948033002

Cr-Commit-Position: refs/heads/master@{#26814}

We already use recursion to iterate over transition trees elsewhere, so this should be safe wrt. call stack height.

Review URL: https://codereview.chromium.org/942523003

Cr-Commit-Position: refs/heads/master@{#26813}

For flushing the input queue, use the input queue lock. Introduce an
explicit refcount to make sure we don't delete the thread object before
all jobs are finished.

BUG=v8:3608
R=yangguo@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/948863002

Cr-Commit-Position: refs/heads/master@{#26812}

We no longer expect NewError to return an empty handle to signal termination
exception, since TryCall simply requests a new terminate exception interrupt.

BUG=chromium:403509
LOG=N

Review URL: https://codereview.chromium.org/952483002

Cr-Commit-Position: refs/heads/master@{#26811}

BUG=v8:3892
LOG=Y

Review URL: https://codereview.chromium.org/953463002

Cr-Commit-Position: refs/heads/master@{#26810}

R=bmeurer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/947153002

Cr-Commit-Position: refs/heads/master@{#26809}

This implements a special case of block cloning to recognize constructs like

 if (a ? b : c) { ... }

that happen to be generated by Emscripten quite often.

Review URL: https://codereview.chromium.org/947963002

Cr-Commit-Position: refs/heads/master@{#26808}

"for-of should throw if result object is not an object"

The CQ committed the CL twice

This reverts commit ab2591ed.

BUG=None
TBR=adamk

Review URL: https://codereview.chromium.org/951133002

Cr-Commit-Position: refs/heads/master@{#26807}

This is done using desugaring. Before this we had:

  result = iterator.next()

with this we instead do:

  !%_IsSpecObject(result = iterator.next()) &&
      %ThrowIteratorResultNotAnObject(result)

BUG=v8:3916
LOG=N

Review URL: https://codereview.chromium.org/929733003

Cr-Commit-Position: refs/heads/master@{#26806}

This is done using desugaring. Before this we had:

  result = iterator.next()

with this we instead do:

  !%_IsSpecObject(result = iterator.next()) &&
      %ThrowIteratorResultNotAnObject(result)

BUG=v8:3916
LOG=N

Review URL: https://codereview.chromium.org/929733003

Cr-Commit-Position: refs/heads/master@{#26805}

R=machenbach@chromium.org, jochen@chromium.org
BUG=crbug.com/344767
LOG=Y

Review URL: https://codereview.chromium.org/946023002

Cr-Commit-Position: refs/heads/master@{#26804}

The adder should be gotten before the iterator.

Motivation: Once this is done we should be able to use a for-of loop
instead which leads to cleaner code and correct behavior once the
for-of loop correctly supports abrupt completion.

BUG=None
LOG=N
R=adamk

Review URL: https://codereview.chromium.org/949933002

Cr-Commit-Position: refs/heads/master@{#26803}

Review URL: https://codereview.chromium.org/955433002

Cr-Commit-Position: refs/heads/master@{#26802}

BUG=v8:3705
LOG=N
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/948843004

Cr-Commit-Position: refs/heads/master@{#26801}

BUG=

Review URL: https://codereview.chromium.org/939623004

Cr-Commit-Position: refs/heads/master@{#26800}

The optimization is invalid as indicated by the test.

BUG=
TBR=yangguo@chromium.org

Review URL: https://codereview.chromium.org/950873003

Cr-Commit-Position: refs/heads/master@{#26799}

NOTRY=true
TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/948003002

Cr-Commit-Position: refs/heads/master@{#26798}

Port 9c1407da

BUG=

Review URL: https://codereview.chromium.org/948843002

Cr-Commit-Position: refs/heads/master@{#26797}

R=verwaest@chromium.org

BUG=

Review URL: https://codereview.chromium.org/892383003

Cr-Commit-Position: refs/heads/master@{#26796}

This also includes a regression test for crbug/459512.

BUG=chromium:459512
LOG=N

Review URL: https://codereview.chromium.org/947103002

Cr-Commit-Position: refs/heads/master@{#26795}

R=verwaest@chromium.org

BUG=v8:3914
LOG=N

Review URL: https://codereview.chromium.org/914333002

Cr-Commit-Position: refs/heads/master@{#26794}

TEST=
BUG=

Review URL: https://codereview.chromium.org/945823002

Cr-Commit-Position: refs/heads/master@{#26793}

Revert of Correctly propagate terminate exception in TryCall. (patchset #2 id:20001 of https://codereview.chromium.org/928193002/)

Reason for revert:
See crbug.com/460412 and crbug.com/460356. Reverting on master in order to roll from master again soon.

Original issue's description:
> Correctly propagate terminate exception in TryCall.
>
> BUG=v8:3892
> LOG=Y
>
> Committed: https://crrev.com/a49b55b78844557b65a98e7a77dd26078157ed7f
> Cr-Commit-Position: refs/heads/master@{#26685}

TBR=ishell@chromium.org,yangguo@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:3892

Review URL: https://codereview.chromium.org/946973004

Cr-Commit-Position: refs/heads/master@{#26792}

Revert of [x64] Improve instruction selection for TruncateInt64ToInt32. (patchset #1 id:1 of https://codereview.chromium.org/936323004/)

Reason for revert:
Breaks SQLite

Original issue's description:
> [x64] Improve instruction selection for TruncateInt64ToInt32.
>
> R=svenpanne@chromium.org
>
> Committed: https://crrev.com/64a2717529e2197f3a789adabf86ca36f5eb764c
> Cr-Commit-Position: refs/heads/master@{#26739}

TBR=svenpanne@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/928723003

Cr-Commit-Position: refs/heads/master@{#26791}

The _GLIBCXX_DEBUG macro is now set by default for Linux Debug builds
and can be disabled using the disable_glibcxx_debug=1 setting
(compatible with Chrome).  This will help us catch problems earlier.

BUG=v8:3638
LOG=n

Review URL: https://codereview.chromium.org/946283003

Cr-Commit-Position: refs/heads/master@{#26790}

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/946553002

Cr-Commit-Position: refs/heads/master@{#26789}

This avoids accidental coercion-to-bool when calling ReportMessage()
in the parser (e.g., from pointer types), and as a bonus makes callsites
easier to read.

Review URL: https://codereview.chromium.org/939303002

Cr-Commit-Position: refs/heads/master@{#26788}

Because we generated a different hash code for 0 and -0 we ended up
not even getting to the SameValueZero check.

BUG=v8:3906
LOG=N
R=adamk

Review URL: https://codereview.chromium.org/947443005

Cr-Commit-Position: refs/heads/master@{#26787}

After further spec reading it turns out that we should not do ToObject
on the iterable.

BUG=None
LOG=N
R=adamk

Review URL: https://codereview.chromium.org/941313003

Cr-Commit-Position: refs/heads/master@{#26786}

Also some target_at and target_at_put uniformed on mips and mips64.

BUG=

Review URL: https://codereview.chromium.org/942123002

Cr-Commit-Position: refs/heads/master@{#26785}

TEST=
BUG=

Review URL: https://codereview.chromium.org/945813002

Cr-Commit-Position: refs/heads/master@{#26784}

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/943503003

Cr-Commit-Position: refs/heads/master@{#26783}

R=vegorov@chromium.org
BUG=v8:3325
LOG=N

Review URL: https://codereview.chromium.org/935393002

Cr-Commit-Position: refs/heads/master@{#26782}

BUG=

Review URL: https://codereview.chromium.org/942833002

Cr-Commit-Position: refs/heads/master@{#26781}

Mechanical change.

This will break dependency between profiler-generator and heap-profiler-generator.
Later this will help us to reuse SourcePosition in cpu-profiler.

BUG=452067
LOG=n

Review URL: https://codereview.chromium.org/945873002

Cr-Commit-Position: refs/heads/master@{#26780}

R=svenpanne@chromium.org
BUG=v8:3776
LOG=N

Review URL: https://codereview.chromium.org/942003002

Cr-Commit-Position: refs/heads/master@{#26779}

R=bmeurer@chromium.org
TEST=unittests/SchedulerTest,unittests/SchedulerRPOTest

Review URL: https://codereview.chromium.org/927653004

Cr-Commit-Position: refs/heads/master@{#26778}