Add noinline for GCC 4.6, which seems to vectorize after inlining.

GCC 4.7 and 4.8 don't need this, but we're not building with them so it doesn't hurt.

BUG=skia:
R=mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/343423003
1 file changed