[x64] Fix testw with immediates.

[x64] Fix testw with immediates.

Assembler::testw(Register, Immediate) and Assembler::testw(const Operand&, Immediate) were emitting only the first 8 bits of a 16-bit immediate, causing unexpected crashes.

This went unnoticed because before http://crrev.com/1948453002 no compiler was using them.

Committed: https://crrev.com/99230f8d0e114d5a31cf3696a012522d5ecc1ccf
Cr-Commit-Position: refs/heads/master@{#36110}

[epertoso, 2016-05-09 13:26:29]

The CQ bit was checked by epertoso@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-05-09 13:26:33]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1962563003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1962563003/1

[epertoso, 2016-05-09 13:26:58]

epertoso@chromium.org changed reviewers:
+ jarin@chromium.org

[Jarin, 2016-05-09 13:28:39]

lgtm. Thanks.

[commit-bot: I haz the power, 2016-05-09 13:48:01]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-05-09 13:48:02]

Dry run: This issue passed the CQ dry run.

[epertoso, 2016-05-09 13:52:17]

The CQ bit was checked by epertoso@chromium.org

[commit-bot: I haz the power, 2016-05-09 13:52:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1962563003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1962563003/1

[commit-bot: I haz the power, 2016-05-09 13:54:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-09 13:55:49]

Description was changed from

==========
[x64] Fix testw with immediates.

Assembler::testw(Register, Immediate) and Assembler::testw(const Operand&,
Immediate) were emitting only the first 8 bits of a 16-bit immediate, causing
unexpected crashes.

This went unnoticed because before http://crrev.com/1948453002 no compiler was
using them.
==========

to

==========
[x64] Fix testw with immediates.

Assembler::testw(Register, Immediate) and Assembler::testw(const Operand&,
Immediate) were emitting only the first 8 bits of a 16-bit immediate, causing
unexpected crashes.

This went unnoticed because before http://crrev.com/1948453002 no compiler was
using them.

Committed: https://crrev.com/99230f8d0e114d5a31cf3696a012522d5ecc1ccf
Cr-Commit-Position: refs/heads/master@{#36110}
==========

[commit-bot: I haz the power, 2016-05-09 13:55:50]

Patchset 1 (id:??) landed as
https://crrev.com/99230f8d0e114d5a31cf3696a012522d5ecc1ccf
Cr-Commit-Position: refs/heads/master@{#36110}