Fangrui Song 89ecb8001a MapVector: add C++17-style try_emplace and insert_or_assign (#71969) ...

Similar to https://wg21.link/n4279

For example, insert_or_assign can be used to simplify
CodeGenModule::AddDeferredUnusedCoverageMapping in
clang/lib/CodeGen/CodeGenModule.cpp

2023-11-12 20:45:37 -08:00

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