llvm-project

37881c63 - [llvm] Replace unordered_{map,set} with Dense{Map,Set} in local maps (#204277)

[llvm] Replace unordered_{map,set} with Dense{Map,Set} in local maps (#204277) std::unordered_map is slow. Replace maps and sets without a pointer-stability requirement to DenseMap/DenseSet. Extracted from #202222