[Clang] Implement CWG2813: Class member access with prvalues (#120223) This is a rebase of #95112 with my own feedback apply as @MitalAshok has been inactive for a while. It's fairly important this makes clang 20 as it is a blocker for #107451 --- [CWG2813](https://cplusplus.github.io/CWG/issues/2813.html) prvalue.member_fn(expression-list) now will not materialize a temporary for prvalue if member_fn is an explicit object member function, and prvalue will bind directly to the object parameter. The E1 in E1.static_member is now a discarded-value expression, so if E1 was a call to a [[nodiscard]] function, there will now be a warning. This also affects C++98 with [[gnu::warn_unused_result]] functions. This should not affect C where TemporaryMaterializationConversion is a no-op. Closes #100314 Fixes #100341 --------- Co-authored-by: Mital Ashok <mital@mitalashok.co.uk>
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