[libc++] Make sure that __desugars_to isn't tripped up by reference_wrapper, const and ref qualifiers (#132092)

Previously, const and ref qualification on an operation would cause
__desugars_to to report false, which would lead to unnecessary
pessimizations. The same holds for reference_wrapper.

In practice, const and ref qualifications on the operation itself are
not relevant to determining whether an operation desugars to something
else or not, so can be ignored.

We are not stripping volatile qualifiers from operations in this patch
because we feel that this requires additional discussion.

Fixes #129312

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