rs6000: Add Power10 optimization for most _mm_movemask*
Power10 ISA added `vextract*` instructions which are realized in the `vec_extractm` instrinsic. Use `vec_extractm` for `_mm_movemask_ps`, `_mm_movemask_pd`, and `_mm_movemask_epi8` compatibility intrinsics, when `_ARCH_PWR10`. 2021-11-29 Paul A. Clarke <pc@us.ibm.com> gcc * config/rs6000/xmmintrin.h (_mm_movemask_ps): Use vec_extractm when _ARCH_PWR10. * config/rs6000/emmintrin.h (_mm_movemask_pd): Likewise. (_mm_movemask_epi8): Likewise.
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