This reverts commit 81ad047ee5.
Revert "VP8 for ARMv8 by using NEON intrinsics 15"
This reverts commit 727af7cebe.
This exposes a bug in gcc 4.9 regarding register allocation. Will reland
when 4.9 is fixed.
Change-Id: I2d8a04e4edde93719280e41550f4c0765608ec4d