Avoid crash on some 64b ARM NEON platforms.

Avoid crash on some 64b ARM NEON platforms.

The compiler may choose to use x30 for a local loop counter;
ensure it's saved. Patch from kevin.petit@arm.com,
verified by benm@google.com.

R=djsollen@google.com

Committed: https://skia.googlesource.com/skia/+/414867c00463e1405ce2234cf7591b1788d20b9f

[djsollen, 2014-12-09 14:59:39]

lgtm

[Tom Hudson, 2014-12-09 15:00:52]

The CQ bit was checked by tomhudson@chromium.org

[commit-bot: I haz the power, 2014-12-09 15:01:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/786273003/1

[commit-bot: I haz the power, 2014-12-09 15:09:13]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/414867c00463e1405ce2234cf7591b1788d20b9f

[Tom Hudson, 2014-12-09 15:11:18]

tomhudson@chromium.org changed reviewers:
- tomhudson@chromium.org

[Tom Hudson, 2014-12-09 15:11:18]

Heather, we'll want to merge this to M40; Mike says Eric & Ravi know how?

[borenet, 2014-12-09 21:02:22]

On 2014/12/09 15:11:18, Tom Hudson wrote:
> Heather, we'll want to merge this to M40; Mike says Eric & Ravi know how?

We don't have an automated process for this, so it'd just be the regular git
way, something like:
$ git checkout chrome/m40
$ git cherry-pick 414867c00463e1405ce2234cf7591b1788d20b9f
$ git push

[hcm, 2014-12-09 21:27:34]

On 2014/12/09 21:02:22, borenet wrote:
> On 2014/12/09 15:11:18, Tom Hudson wrote:
> > Heather, we'll want to merge this to M40; Mike says Eric & Ravi know how?
> 
> We don't have an automated process for this, so it'd just be the regular git
> way, something like:
> $ git checkout chrome/m40
> $ git cherry-pick 414867c00463e1405ce2234cf7591b1788d20b9f
> $ git push

Yes, there is an outdated page on our site that I'm in process of moving and
updating, Eric's instructions are right.  The other thing is the merge process
in Chrome to let them know its incoming, documented here:
https://sites.google.com/a/google.com/skia/chrome-merge-process