[libcxx] [llvm] Add C++23 stacktrace (P0881R7) (PR #136528)

[Hristo Hristov via llvm-commits]

H-G-Hristov wrote:

@elsteveogrande BTW It's better to use "merge" after the review started because rebasing affects the comments on GH.

https://github.com/llvm/llvm-project/pull/136528