use same macros as row_gcc.cc
use same macros as row_gcc.cc

R=harryjin@google.com
BUG=libyuv:488

Review URL: https://codereview.chromium.org/1343863002 .

yarrcc/libyuv-ios,disigma/yuv,lemenkov/libyuv,lemenkov/libyuv,yarrcc/libyuv-ios,lemenkov/libyuv,disigma/yuv,lemenkov/libyuv,disigma/yuv,yarrcc/libyuv-ios,yarrcc/libyuv-ios