Add support for NEON intrinsics to speed up texture compression. We can
now convert the time that we would have spent uploading the texture to
compressing it giving a net 50% memory savings for these things.

R=robertphillips@google.com, mtklein@google.com, kevin.petit@arm.com

Author: krajcevski@google.com

Review URL: https://codereview.chromium.org/390453002
7 files changed