[flang] [lldb] [compiler-rt] [libcxx] [clang-tools-extra] [lld] [libc] [clang] [llvm] MapVector: add C++17-style try_emplace and insert_or_assign (PR #71969)

[Fangrui Song via cfe-commits]

https://github.com/MaskRay edited 
https://github.com/llvm/llvm-project/pull/71969
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