Various cleanups: product code #4444
Merged
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_Popcount_fallback(), afterif constexpr ... returnaddelseto avoid dead code.if constexpr._STDqualification on types, variable templates, and alias templates.namespace std.yvals_core.h: Improve "error STL1003: Unexpected compiler, expected C++ compiler." like use onlystatic_assertfor_EMIT_STL_ERROR#4020._STL_STRINGIZEdown to its point of use, near our other macros.