Add support for x86_64 assembly and intrinsics to the cmake build.
Darwin/Linux x86_64 only. BUG=https://bugs.chromium.org/p/aomedia/issues/detail?id=76 Change-Id: I1500c085f26066ac0108017b5155aba0f003427c
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Darwin/Linux x86_64 only. BUG=https://bugs.chromium.org/p/aomedia/issues/detail?id=76 Change-Id: I1500c085f26066ac0108017b5155aba0f003427c