libyuv r1633 for HalfFloat Neon for ARMv7.

Other changes include:
Mips MSA optimize YUV to RGB
Gentoo inline bug fix for I420AlphaToARGB
GN support for iOS

Change log:
https://chromium.googlesource.com/libyuv/libyuv/+log/550cf829..97fb18b8
Full changes
https://chromium.googlesource.com/libyuv/libyuv/+/550cf829..97fb18b8

TEST=TestHalfFloatPlane_denormalTestHalfFloatPlane_denormal
BUG=libyuv:560, libyuv:643, libyuv:602, libyuv:634, libyuv:658
[email protected]

Review-Url: https://codereview.chromium.org/2484833004
Cr-Commit-Position: refs/heads/master@{#430822}
1 file changed