6351993da7
This is a roll forward of D101895 with two additional fixes: Original Patch description: > This is a follow up on D101524 which: > > - simplifies cpu features detection and usage, > - flattens target dependent optimizations so it's obvious which implementations are generated, > - provides an implementation targeting the host (march/mtune=native) for the mem* functions, > - makes sure all implementations are unittested (provided the host can run them). Additional fixes: - Fix uninitialized ALL_CPU_FEATURES - Use non pseudo microarch as it is only supported from Clang 12 on Differential Revision: https://reviews.llvm.org/D102233
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