Fix for clang ia32 on linux which does not support optimize attribute. BUG=libyuv bug 83 TEST=./build/gyp_chromium --depth=. -Dtarget_arch=ia32 -Dclang=1 webrtc.gyp && make libyuv Review URL: https://webrtc-codereview.appspot.com/790004
Fix for clang ia32 on linux which does not support optimize attribute.
BUG=libyuv bug 83
TEST=./build/gyp_chromium --depth=. -Dtarget_arch=ia32 -Dclang=1 webrtc.gyp && make libyuv
Review URL: https://webrtc-codereview.appspot.com/790004

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@2731 4adac7df-926f-26a2-2b94-8c16560cd09d

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