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Details:
1. Unrolled by a factor 5. This gave around 1GFLOPS gain
2. Changed CMP to subs and remove nan. CMP uses a lot of
compare, which is higher in latency and more number of
instructions. Replacing with subs and remove nan
reduced it to 3 instructions and lighter ones.
3. Added remove nan function.
4. Added AVX512 definition in skx context.
5. Disabled code in AMAXV kernel depending on AVX512 flag
exists or not
Change-Id: I191725a55bc33edf8d537156292cf997d6a5fe35