ARM Skia NEON patches - 24 - S32_D565_Blend_Dither slight speedup/bugfix

ARM Skia NEON patches - 24 - S32_D565_Blend_Dither slight speedup/bugfix




BlitRow565: S32_D565_Blend_Dither, slight speedup + bugfix

This patch adds a rewrite of S32_D565_Blend_Dither in intrinsics.
The newer version is faster (10-20% depending on the value of count)
and also supports ARGB as well as ABGR. It also adds the missing
assert at the beginning of the function.

Signed-off-by: Kévin PETIT <kevin.petit@arm.com>;

BUG=

Committed: http://code.google.com/p/skia/source/detail?r=11473

[kevin.petit.not.used.account, 2013-09-26 11:05:51]

ping.

This one is just a basic translation and should be easy:
    - no mismatches.
    - nice speedup
    - portability
    - bugfix on linux

[djsollen, 2013-09-26 15:00:19]

lgtm

[commit-bot: I haz the power, 2013-09-26 15:13:41]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/kevin.petit.arm@gmail.com/22566002/1

[commit-bot: I haz the power, 2013-09-26 15:25:26]

Change committed as 11473