Revert of [arm] Fix recognition of VNEG. (patchset #3 id:40001 of https://codereview.chromium.org/762493006/)

Reason for revert:
Breaks arm compilation.

Original issue's description:
> [arm] Fix recognition of VNEG.
>
> TEST=mjsunit,unittests
> R=svenpanne@chromium.org
>
> Committed: https://chromium.googlesource.com/v8/v8/+/2aed882fe74dbf9210159babe30fedccd900e7cf

TBR=svenpanne@chromium.org,bmeurer@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/751653004

Cr-Commit-Position: refs/heads/master@{#25514}

TEST=mjsunit,unittests
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/762493006

Cr-Commit-Position: refs/heads/master@{#25513}

TBR=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/752733003

Cr-Commit-Position: refs/heads/master@{#25512}

TBR=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/755283004

Cr-Commit-Position: refs/heads/master@{#25511}

Running this in x64.release mode on a powerful HP620 takes 4 seconds,
this is at least 2 orders of magnitude too slow and leads to tons of
false positives on our build bots due to timeouts. As it is, the
cost-benefit ratio is far too low.

The whole approach needs to be changed: Instead of trying to exhaust
some search space in unit tests, this should be turned into a fuzzing
test where only a small but random number of things are tested. The
exhaustive approach can be done separately, but definitely not in the
unit tests.

BUG=v8:3707

Review URL: https://codereview.chromium.org/762743002

Cr-Commit-Position: refs/heads/master@{#25510}

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/757503002

Patch from Weiliang Lin <weiliang.lin@intel.com>.

Cr-Commit-Position: refs/heads/master@{#25509}

R=dcarney@chromium.org
BUG=

Review URL: https://codereview.chromium.org/758073002

Cr-Commit-Position: refs/heads/master@{#25508}

Also, add a check for debug mode.

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

Review URL: https://codereview.chromium.org/758043002

Cr-Commit-Position: refs/heads/master@{#25507}

Revert "Distinguish beween final incremental mark-compact and full mark-compact event in IdleNotification."

This reverts commit d15d453f for
breaking cctest/test-api/Threading3.

TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/758163003

Cr-Commit-Position: refs/heads/master@{#25506}

BUG=v8:3693
R=ulan@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/752063002

Cr-Commit-Position: refs/heads/master@{#25505}

R=mvstanton@chromium.org
BUG=chromium:436447

Review URL: https://codereview.chromium.org/756983003

Cr-Commit-Position: refs/heads/master@{#25504}

R=rossberg@chromium.org
BUG=v8:2858
LOG=N

Review URL: https://codereview.chromium.org/748113003

Cr-Commit-Position: refs/heads/master@{#25503}

Non-numeric static local variables are not thread-safe, and the case
at hand was a premature optimization anyway: The generated code for
the check in question is exactly the same when unfolded.

BUG=chromium:420483

Review URL: https://codereview.chromium.org/756903003

Cr-Commit-Position: refs/heads/master@{#25502}

BUG=

Review URL: https://codereview.chromium.org/727323004

Cr-Commit-Position: refs/heads/master@{#25501}

BUG=chromium:434447

Review URL: https://codereview.chromium.org/755173002

Cr-Commit-Position: refs/heads/master@{#25500}

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/755883003

Cr-Commit-Position: refs/heads/master@{#25499}

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/757983002

Cr-Commit-Position: refs/heads/master@{#25498}

Port 100db758

BUG=v8:3629
LOG=N

Review URL: https://codereview.chromium.org/755693002

Cr-Commit-Position: refs/heads/master@{#25497}

BUG=

Review URL: https://codereview.chromium.org/758643003

Cr-Commit-Position: refs/heads/master@{#25496}

Follow-up to 87db4ff1, which added
suppressions to unittests.status and a special case for Android to the
ThreadLocalStorageTest, both of which are unneccessary and should be
handled differently for the GTest based unittests.

BUG=v8:3706
LOG=n
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/757913002

Cr-Commit-Position: refs/heads/master@{#25495}

BUG=

Review URL: https://codereview.chromium.org/750963002

Cr-Commit-Position: refs/heads/master@{#25494}

Don't double smi-tag the mask used to check read-only / field mode in the dictionary-store-stub on X64

BUG=

Review URL: https://codereview.chromium.org/757673002

Cr-Commit-Position: refs/heads/master@{#25493}

cctest/test-threads/ThreadJoinSelf is suppressed for Android, but the
test has since been moved to unittests/Thread.SelfJoin. Move the
suppression to unittests.status.

unittests/ThreadLocalStorageTest.DoTest fails on older Android devices
as it assumes the availability of more TLS slots than many devices
implement. Test a smaller number of slots (32) on Android. Remove old
suppression of test-platform-tls/FastTLS (which no longer exists).

cctest/test-mark-compact/RegressJoinThreadsOnIsolateDeinit can't deal
with shared mappings. Check for 's' instead of '-'.

BUG=v8:3706
LOG=

Review URL: https://codereview.chromium.org/735863003

Cr-Commit-Position: refs/heads/master@{#25492}

Resets the scaled exponent to 0 when the scaling match fails.

BUG=

Review URL: https://codereview.chromium.org/756643002

Cr-Commit-Position: refs/heads/master@{#25491}

BUG=v8:3629
LOG=N
TBR=verwaest@chromium.org

Review URL: https://codereview.chromium.org/753223002

Cr-Commit-Position: refs/heads/master@{#25490}

TBR=ulan@chromium.org
BUG=v8:3723
LOG=N

Review URL: https://codereview.chromium.org/749283002

Cr-Commit-Position: refs/heads/master@{#25489}

This sample used to demonstrate the usage of the DebuggerAgent. The latter
has been removed, so this sample has no point anymore.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/754043002

Cr-Commit-Position: refs/heads/master@{#25488}

R=jochen@chromium.org

Review URL: https://codereview.chromium.org/739253006

Cr-Commit-Position: refs/heads/master@{#25487}

R=ulan@chromium.org
BUG=v8:3717
LOG=N

Review URL: https://codereview.chromium.org/758523004

Cr-Commit-Position: refs/heads/master@{#25486}

This avoids allocating vector ic slots that we don't use.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/758543002

Cr-Commit-Position: refs/heads/master@{#25485}

BUG=chromium:435974
LOG=N

Review URL: https://codereview.chromium.org/755583003

Cr-Commit-Position: refs/heads/master@{#25484}

Review URL: https://codereview.chromium.org/751643005

Cr-Commit-Position: refs/heads/master@{#25483}

Review URL: https://codereview.chromium.org/739013004

Cr-Commit-Position: refs/heads/master@{#25482}

BUG=421063

Review URL: https://codereview.chromium.org/746263002

Cr-Commit-Position: refs/heads/master@{#25481}

The file snapshot_blob_host.bin was supposed to be generated when building the host toolset. However, the file snapshot_blob.bin was being generated instead, under every set of conditions.

Because of this, every time we build the host toolset, snapshot_blob_host.bin is not found. This causes the target (v8_external_snapshot) that generates such file to be run. This target generates snapshot_blob.bin instead of snapshot_blob_host.bin. This in turn causes all the targets that depend on snapshot_blob.bin to run again.

After this, we still don't have snapshot_blob_host.bin. So the next time we build, the whole process described above happens again.

BUG=421063

Review URL: https://codereview.chromium.org/741223002

Cr-Commit-Position: refs/heads/master@{#25480}

TEST=unittests
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/749233002

Cr-Commit-Position: refs/heads/master@{#25479}

BUG=

Review URL: https://codereview.chromium.org/756553002

Cr-Commit-Position: refs/heads/master@{#25478}

R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/754803002

Cr-Commit-Position: refs/heads/master@{#25477}

R=jkummerow@chromium.org
BUG=435825
LOG=N

Review URL: https://codereview.chromium.org/753983002

Cr-Commit-Position: refs/heads/master@{#25476}

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/730183005

Cr-Commit-Position: refs/heads/master@{#25475}