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* x86-64: Add memset family functions with 256-bit EVEXH.J. Lu2022-01-271-0/+24
Update ifunc-memset.h/ifunc-wmemset.h to select the function optimized with 256-bit EVEX instructions using YMM16-YMM31 registers to avoid RTM abort with usable AVX512VL and AVX512BW since VZEROUPPER isn't needed at function exit. (cherry picked from commit 1b968b6b9b3aac702ac2f133e0dd16cfdbb415ee)