Borrow Android's ARMv6 memory barrier for SkOnce.

BUG=skia:1743
R=bungeman@google.com

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/34353009

git-svn-id: http://skia.googlecode.com/svn/trunk@11941 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed