[libcxx] [clang] [SemaCXX] Implement CWG2137 (list-initialization from objects of the same type) (PR #77768)

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cor3ntin wrote:

@MitalAshok Could you look at that today? Otherwise we need to revert - both in main and in the 18 branch

https://github.com/llvm/llvm-project/pull/77768