libyuv roll to r1470 from r1466
Purpose of this roll is to enable lto for arm llvm builds:
Re-enable LLVM LTO on Neon targets.
LTO was disabled due to a GCC compiler bug that does not affect LLVM.
This fixes the build in the cfi_vptr==1 configuration, which requires LLVM LTO.
Contains the following libyuv revisions:
https://chromium.googlesource.com/libyuv/libyuv/+log/
cda9d38a4..
ee9aaea02
R=pcc@google.com
BUG=chromium:469376,chromium:267773
Review URL: https://codereview.chromium.org/
1295403004
Cr-Commit-Position: refs/heads/master@{#344659}