llvm-project

d55e235b - [memprof] Use std::unique_ptr instead of std::optional (#94655)

[memprof] Use std::unique_ptr instead of std::optional (#94655) Changing the type of Frame::SymbolName from std::optional<std::string> to std::unique<std::string> reduces sizeof(Frame) from 64 to 32. The smaller type reduces the cycle and instruction counts by 23% and 4.4%, respectively, with "llvm-profdata show" modified to deserialize all MemProfRecords in a MemProf V2 profile. The peak memory usage is cut down nearly by half.