sk_memcpy32 should fall back on libc memcpy.

Writing it out ourselves was a ~2x slowdown on ARM.

BUG=skia:
R=henrik.smiding@intel.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/292663013

git-svn-id: http://skia.googlecode.com/svn/trunk@14886 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed