[clang] [libcxx] [Clang][libc++] Implement C++23 std::start_lifetime_as (P2590R2, P2679R2) (PR #196286)

[Yash Verma via cfe-commits]

https://github.com/My-Bad-2 edited 
https://github.com/llvm/llvm-project/pull/196286
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