[clang] [Clang] Implement LWG3819 for `__reference_meows_from_temporary` (PR #142554)

[A. Jiang via cfe-commits]

frederick-vs-ja wrote:

> I am assuming you want to handle the libc++ changes separately? (They would need tests/status update)

Yeah. I guess it's better to separate the changes in two PRs, as combination of another library implementation with Clang will benefit slightly more quickly.

https://github.com/llvm/llvm-project/pull/142554