[PATCH] c++: Add std::to_underlying to the set of stdlib functions that are always folded

[Ville Voutilainen]

This function is yet another stdlib function that is just a simple
cast, so having
it appear while debugging is arguably not useful. So add it to the
existing handling
that always-folds some stdlib functions.

Add std::to_underlying to the set of stdlib functions that are always folded

gcc/cp/ChangeLog:
        * cp-gimplify.cc (cp_fold): Add to_underlying.

gcc/testsuite/ChangeLog:
        * g++.dg/opt/pr96780_cpp23.C: New.

libstdc++/ChangeLog:
        * include/std/utility (to_underlying): Add the
__always_inline__ attribute.
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