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While working on C++20 operator<=>, I noticed that build_new_op_1 was doing too much conversion when a built-in candidate was selected; the standard says it should only perform user-defined conversions, and then leave the normal operator semantics to handle any standard conversions. This is important for operator<=> because a comparison of two different unscoped enums is ill-formed; if we promote the enums to int here, cp_build_binary_op never gets to see the original operand types, so we can't give the error. I'm also disabling -Wmaybe-uninitialized for expmed.c to avoid the bootstrap failure from the last time I applied this patch. * call.c (build_new_op_1): Don't apply any standard conversions to the operands of a built-in operator. Don't suppress conversions in cp_build_unary_op. * typeck.c (cp_build_unary_op): Do integral promotions for enums. PR tree-optimization/91825 * expmed.c: Reduce -Wmaybe-uninitialized to warning. From-SVN: r277864
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