GN: Move x86 Clang -mstackrealign workaround to its own config, elide it where problematic

GN: Move x86 Clang -mstackrealign workaround to its own config, elide it where problematic

crrev.com/365770 tried to avoid the -mstackrealign flag for building
the breakpad code, but the GN changes there were not valid.  This
change refactors the problematic -mstackrealign (and related
-mstack-alignment=16) flags out of compiler_codegen into its own
config that can be removed for components building breakpad code.

BUG=418554, 556393
R=brettw@chromium.org, thestig@chromium.org

Committed: https://crrev.com/8a97d7152b60975275c88ad070677d5a75f344e7
Cr-Commit-Position: refs/heads/master@{#370464}

[Nico, 2016-01-15 22:56:05]

thakis@chromium.org changed reviewers:
+ thakis@chromium.org

[Nico, 2016-01-15 22:56:06]

lgtm

[Lei Zhang, 2016-01-15 23:05:55]

lgtm, thanks!

[Roland McGrath, 2016-01-15 23:08:46]

brettw: need OWNERS review for BUILDCONFIG.gn

Thanks,
Roland

[brettw, 2016-01-19 23:27:26]

lgtm

[Roland McGrath, 2016-01-20 18:39:59]

The CQ bit was checked by mcgrathr@chromium.org

[commit-bot: I haz the power, 2016-01-20 18:40:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1598523002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1598523002/1

[commit-bot: I haz the power, 2016-01-20 20:09:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-20 20:09:50]

Description was changed from

==========
GN: Move x86 Clang -mstackrealign workaround to its own config, elide it where
problematic

crrev.com/365770 tried to avoid the -mstackrealign flag for building
the breakpad code, but the GN changes there were not valid.  This
change refactors the problematic -mstackrealign (and related
-mstack-alignment=16) flags out of compiler_codegen into its own
config that can be removed for components building breakpad code.

BUG=418554,556393
R=brettw@chromium.org, thestig@chromium.org
==========

to

==========
GN: Move x86 Clang -mstackrealign workaround to its own config, elide it where
problematic

crrev.com/365770 tried to avoid the -mstackrealign flag for building
the breakpad code, but the GN changes there were not valid.  This
change refactors the problematic -mstackrealign (and related
-mstack-alignment=16) flags out of compiler_codegen into its own
config that can be removed for components building breakpad code.

BUG=418554,556393
R=brettw@chromium.org, thestig@chromium.org

Committed: https://crrev.com/8a97d7152b60975275c88ad070677d5a75f344e7
Cr-Commit-Position: refs/heads/master@{#370464}
==========

[commit-bot: I haz the power, 2016-01-20 20:09:51]

Patchset 1 (id:??) landed as
https://crrev.com/8a97d7152b60975275c88ad070677d5a75f344e7
Cr-Commit-Position: refs/heads/master@{#370464}