[stubs] Introduce ToIntegerStub and unify the handling of %_ToInteger.

[stubs] Introduce ToIntegerStub and unify the handling of %_ToInteger.

This adds a new TurboFan-based ToIntegerStub, similar to the
ToLengthStub, and uses it whereever we had custom code for %_ToInteger
previously.

R=yangguo@chromium.org
BUG=v8:4587
LOG=n

Committed: https://crrev.com/6761224c9775878555c46798e919198a6bc75039
Cr-Commit-Position: refs/heads/master@{#35190}

[Benedikt Meurer, 2016-04-01 07:35:39]

Hey Yang,

Some cleanup now that we have Float64Trunc in the CodeStubAssembler. :-)
Please take a look.

Thanks,
Benedikt

[Yang, 2016-04-01 07:44:10]

lgtm

[Benedikt Meurer, 2016-04-01 07:44:28]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-04-01 07:44:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1846683006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1846683006/1

[commit-bot: I haz the power, 2016-04-01 08:00:43]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-01 08:02:04]

Description was changed from

==========
[stubs] Introduce ToIntegerStub and unify the handling of %_ToInteger.

This adds a new TurboFan-based ToIntegerStub, similar to the
ToLengthStub, and uses it whereever we had custom code for %_ToInteger
previously.

R=yangguo@chromium.org
BUG=v8:4587
LOG=n
==========

to

==========
[stubs] Introduce ToIntegerStub and unify the handling of %_ToInteger.

This adds a new TurboFan-based ToIntegerStub, similar to the
ToLengthStub, and uses it whereever we had custom code for %_ToInteger
previously.

R=yangguo@chromium.org
BUG=v8:4587
LOG=n

Committed: https://crrev.com/6761224c9775878555c46798e919198a6bc75039
Cr-Commit-Position: refs/heads/master@{#35190}
==========

[commit-bot: I haz the power, 2016-04-01 08:02:05]

Patchset 1 (id:??) landed as
https://crrev.com/6761224c9775878555c46798e919198a6bc75039
Cr-Commit-Position: refs/heads/master@{#35190}