Revert of Spin off just SkLazyFnPtr from 305513002. (https://codereview.chromium.org/305753002/)

Reason for revert:
depends on bad cl

Original issue's description:
> Spin off just SkLazyFnPtr from 305513002.
>
> The memory barrier in SkOnce is a perf regression for sk_mem{set,cpy} in
> SkUtils on ARM.  We can do a lot better for function pointers.
>
> BUG=skia:
>
> Committed: http://code.google.com/p/skia/source/detail?r=14929

R=bungeman@google.com, mtklein@chromium.org
TBR=bungeman@google.com, mtklein@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/300843012

git-svn-id: http://skia.googlecode.com/svn/trunk@14933 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed