MIPS: Fix Neg_s and Neg_d for loongson and r1

MIPS: Fix Neg_s and Neg_d for loongson and r1

For arch variants loongson and r1 neg instruction does not change the
sign for NaN-like operands, the same as r2 neg. This fix adjusts macro
assembler Neg_s and Neg_d arch variant logic so the correct code would
be generated for loongson and r1.

BUG=

Committed: https://crrev.com/1ceb9aeca68829d609ffc2a6283d966f7ec5b658
Cr-Commit-Position: refs/heads/master@{#39007}

[miran.karic, 2016-08-29 12:40:04]

miran.karic@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, balazs.kilvady@imgtec.com,
ivica.bogosavljevic@imgtec.com, marija.antic@imgtec.com

[balazs.kilvady, 2016-08-30 10:51:28]

LGTM

[miran.karic, 2016-08-30 11:19:59]

The CQ bit was checked by miran.karic@imgtec.com

[commit-bot: I haz the power, 2016-08-30 11:20:07]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-30 11:43:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-30 11:44:43]

Description was changed from

==========
MIPS: Fix Neg_s and Neg_d for loongson and r1

For arch variants loongson and r1 neg instruction does not change the
sign for NaN-like operands, the same as r2 neg. This fix adjusts macro
assembler Neg_s and Neg_d arch variant logic so the correct code would
be generated for loongson and r1.

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

to

==========
MIPS: Fix Neg_s and Neg_d for loongson and r1

For arch variants loongson and r1 neg instruction does not change the
sign for NaN-like operands, the same as r2 neg. This fix adjusts macro
assembler Neg_s and Neg_d arch variant logic so the correct code would
be generated for loongson and r1.

BUG=

Committed: https://crrev.com/1ceb9aeca68829d609ffc2a6283d966f7ec5b658
Cr-Commit-Position: refs/heads/master@{#39007}
==========

[commit-bot: I haz the power, 2016-08-30 11:44:44]

Patchset 1 (id:??) landed as
https://crrev.com/1ceb9aeca68829d609ffc2a6283d966f7ec5b658
Cr-Commit-Position: refs/heads/master@{#39007}