[arm] Clean up handling of usat.

[arm] Clean up handling of usat.

The usat instruction is available from ARMv6, so there's no need to
check for the ARMv7 feature before using it. ARMv6 is the oldest
supported architecture in V8.

Correcting this allows the removal of a special case for predictable
code size.

BUG=

Committed: https://crrev.com/83b9e1bee417919c2a9299bf4a8e176398bb021c
Cr-Commit-Position: refs/heads/master@{#36218}

[jbramley, 2016-05-12 17:43:03]

jacob.bramley@arm.com changed reviewers:
+ bmeurer@chromium.org, jarin@chromium.org

[Benedikt Meurer, 2016-05-12 17:44:47]

Awesome cleanup. LGTM.

[jbramley, 2016-05-12 17:46:22]

The CQ bit was checked by jacob.bramley@arm.com

[commit-bot: I haz the power, 2016-05-12 17:46:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1974903002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1974903002/1

[commit-bot: I haz the power, 2016-05-12 18:18:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-12 18:20:43]

Description was changed from

==========
[arm] Clean up handling of usat.

The usat instruction is available from ARMv6, so there's no need to
check for the ARMv7 feature before using it. ARMv6 is the oldest
supported architecture in V8.

Correcting this allows the removal of a special case for predictable
code size.

BUG=
==========

to

==========
[arm] Clean up handling of usat.

The usat instruction is available from ARMv6, so there's no need to
check for the ARMv7 feature before using it. ARMv6 is the oldest
supported architecture in V8.

Correcting this allows the removal of a special case for predictable
code size.

BUG=

Committed: https://crrev.com/83b9e1bee417919c2a9299bf4a8e176398bb021c
Cr-Commit-Position: refs/heads/master@{#36218}
==========

[commit-bot: I haz the power, 2016-05-12 18:20:44]

Patchset 1 (id:??) landed as
https://crrev.com/83b9e1bee417919c2a9299bf4a8e176398bb021c
Cr-Commit-Position: refs/heads/master@{#36218}