Go back to storeAligned / LoadAligned for SkPMFloat <->Sk4f.

Go back to storeAligned / LoadAligned for SkPMFloat <->Sk4f.

This seems to fix the miscompilation bug on ARM64 / Release / GCC 4.9.

We switched this over originally for perf issues with NEON, but I can't see any now.  Will keep an eye out.

BUG=skia:3570
Committed: https://skia.googlesource.com/skia/+/4b65059e6eea7d90ff3547e4656f7659d3815dc4

[mtklein, 2015-03-24 15:53:00]

mtklein@google.com changed reviewers:
+ mtklein@google.com

[mtklein, 2015-03-24 15:53:00]

The CQ bit was checked by mtklein@google.com

[mtklein, 2015-03-24 15:53:00]

lgtm

[commit-bot: I haz the power, 2015-03-24 15:53:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1026403002/1

[mtklein, 2015-03-24 16:45:43]

The CQ bit was checked by mtklein@google.com

[mtklein, 2015-03-24 16:45:43]

The CQ bit was unchecked by mtklein@google.com

[mtklein, 2015-03-24 16:46:44]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-03-24 16:47:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1026403002/1

[commit-bot: I haz the power, 2015-03-24 16:47:15]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/4b65059e6eea7d90ff3547e4656f7659d3815dc4