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86134c7278
Replaced vzeroall instruction with vxorpd and vmovapd for dgemm kernels -both AVX2 and AVX512. vzeroall is expensive instruction and replaced it with faster version of zeroing all registers. vzeroupper() instruction is also added at the end of AVX2 kernels to avoid any AVX2/SSE transition penalities. Kindly note only the main kernels are modified. Change-Id: Ieb9bc629db01f0f94dd0e8e55550940d3d7eb2a4