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POWER7 does not support __vector long long reductions, making the generic _S_popcount implementation ill-formed. Specializing _S_popcount for PPC allows optimization and avoids the issue. libstdc++-v3/ChangeLog: * include/experimental/bits/simd.h: Add __have_power10vec conditional on _ARCH_PWR10. * include/experimental/bits/simd_builtin.h: Forward declare _MaskImplPpc and use it as _MaskImpl when __ALTIVEC__ is defined. (_MaskImplBuiltin::_S_some_of): Call _S_popcount from the _SuperImpl for optimizations and correctness. * include/experimental/bits/simd_ppc.h: Add _MaskImplPpc. (_MaskImplPpc::_S_popcount): Implement via vec_cntm for POWER10. Otherwise, for >=int use -vec_sums divided by a sizeof factor. For <int use -vec_sums(vec_sum4s(...)) to sum all mask entries.
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