x86_64: Add log2 with FMA
On Skylake, it improves log2 bench performance by: Before After Improvement max 208.779 63.827 69% min 9.977 6.55 34% mean 10.366 6.8191 34%
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On Skylake, it improves log2 bench performance by: Before After Improvement max 208.779 63.827 69% min 9.977 6.55 34% mean 10.366 6.8191 34%