[crankshaft] Remove the useless HMapEnumLength instruction.

[crankshaft] Remove the useless HMapEnumLength instruction.

There's no need to have HMapEnumLength as a dedicated instruction,
as it can be expressed using a HLoadNamedField plus an HBitwiseAnd
operation.

R=jarin@chromium.org
BUG=v8:3650
LOG=n

Committed: https://crrev.com/441af2e6b3a4fd1c72dc302b895752f1d53daa87
Cr-Commit-Position: refs/heads/master@{#33439}

[Benedikt Meurer, 2016-01-21 14:05:45]

Hey Jaro,

Some small cleanup I ran across.
Please take a look.

Thanks,
Benedikt

[Jarin, 2016-01-21 15:24:18]

lgtm

[Jarin, 2016-01-21 15:24:21]

The CQ bit was checked by jarin@chromium.org

[commit-bot: I haz the power, 2016-01-21 15:24:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1614943002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1614943002/20001

[commit-bot: I haz the power, 2016-01-21 15:26:23]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-01-21 15:27:03]

Description was changed from

==========
[crankshaft] Remove the useless HMapEnumLength instruction.

There's no need to have HMapEnumLength as a dedicated instruction,
as it can be expressed using a HLoadNamedField plus an HBitwiseAnd
operation.

R=jarin@chromium.org
BUG=v8:3650
LOG=n
==========

to

==========
[crankshaft] Remove the useless HMapEnumLength instruction.

There's no need to have HMapEnumLength as a dedicated instruction,
as it can be expressed using a HLoadNamedField plus an HBitwiseAnd
operation.

R=jarin@chromium.org
BUG=v8:3650
LOG=n

Committed: https://crrev.com/441af2e6b3a4fd1c72dc302b895752f1d53daa87
Cr-Commit-Position: refs/heads/master@{#33439}
==========

[commit-bot: I haz the power, 2016-01-21 15:27:04]

Patchset 2 (id:??) landed as
https://crrev.com/441af2e6b3a4fd1c72dc302b895752f1d53daa87
Cr-Commit-Position: refs/heads/master@{#33439}