[turbofan] Introduce proper abstractions for ToNumber truncations.

[turbofan] Introduce proper abstractions for ToNumber truncations.

Introduce TruncateTaggedToFloat64 and TruncateTaggedToWord32 into the
CodeStubAssembler, which encapsulates the ToNumber truncation and
returns the resulting number as either Float64 or further truncated to
Word32.

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

Committed: https://crrev.com/1abd78979c29f74f2455961deaa1a83670cd6521
Cr-Commit-Position: refs/heads/master@{#35051}

[Jarin, 2016-03-24 05:45:09]

lgtm

[Benedikt Meurer, 2016-03-24 05:45:23]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-03-24 05:45:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1827813004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1827813004/1

[commit-bot: I haz the power, 2016-03-24 06:05:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-24 06:06:57]

Description was changed from

==========
[turbofan] Introduce proper abstractions for ToNumber truncations.

Introduce TruncateTaggedToFloat64 and TruncateTaggedToWord32 into the
CodeStubAssembler, which encapsulates the ToNumber truncation and
returns the resulting number as either Float64 or further truncated to
Word32.

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

to

==========
[turbofan] Introduce proper abstractions for ToNumber truncations.

Introduce TruncateTaggedToFloat64 and TruncateTaggedToWord32 into the
CodeStubAssembler, which encapsulates the ToNumber truncation and
returns the resulting number as either Float64 or further truncated to
Word32.

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

Committed: https://crrev.com/1abd78979c29f74f2455961deaa1a83670cd6521
Cr-Commit-Position: refs/heads/master@{#35051}
==========

[commit-bot: I haz the power, 2016-03-24 06:06:58]

Patchset 1 (id:??) landed as
https://crrev.com/1abd78979c29f74f2455961deaa1a83670cd6521
Cr-Commit-Position: refs/heads/master@{#35051}