PPC: Disable gcc generation of fmadd/fmsub in cctests.

PPC: Disable gcc generation of fmadd/fmsub in cctests.

Generated code performs distinct floating multiply and add/subtract
operations.  Tests fail when GCC uses fmadd/fmsub to calculate the
expected result since these instructions provide higher accuracy due
to the lack of an intermediate round.

R=machenbach@chromium.org
BUG=

Committed: https://crrev.com/40eeb69b94e2ca6fa69fd38d2453e84ce7c26b6d
Cr-Commit-Position: refs/heads/master@{#31918}

[MTBrandyberry, 2015-11-09 21:39:46]

Common gyp file change.

[MTBrandyberry, 2015-11-09 21:39:57]

The CQ bit was checked by mbrandy@us.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2015-11-09 21:40:00]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1416123007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1416123007/1

[MTBrandyberry, 2015-11-09 21:40:41]

Description was changed from

==========
PPC: Disable gcc generation of fmadd/fmsub in cctests.

Generated code performs distinct floating multiply and add/subtract
operations.  Tests fail when GCC uses fmadd/fmsub to calculate the
expected result since these instructions provide higher accuracy due
to the lack of an intermediate round.

R=machenbach@chromium.org
BUG=
==========

to

==========
PPC: Disable gcc generation of fmadd/fmsub in cctests.

Generated code performs distinct floating multiply and add/subtract
operations.  Tests fail when GCC uses fmadd/fmsub to calculate the
expected result since these instructions provide higher accuracy due
to the lack of an intermediate round.

R=machenbach@chromium.org
BUG=
==========

[MTBrandyberry, 2015-11-09 21:40:41]

mbrandy@us.ibm.com changed reviewers:
+ michael_dawson@ca.ibm.com

[commit-bot: I haz the power, 2015-11-09 21:55:20]

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

[commit-bot: I haz the power, 2015-11-09 21:55:20]

Dry run: This issue passed the CQ dry run.

[Michael Achenbach, 2015-11-10 06:58:54]

lgtm

[MTBrandyberry, 2015-11-10 14:29:55]

The CQ bit was checked by mbrandy@us.ibm.com

[commit-bot: I haz the power, 2015-11-10 14:30:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1416123007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1416123007/1

[commit-bot: I haz the power, 2015-11-10 14:31:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-10 14:31:38]

Patchset 1 (id:??) landed as
https://crrev.com/40eeb69b94e2ca6fa69fd38d2453e84ce7c26b6d
Cr-Commit-Position: refs/heads/master@{#31918}