Add support for SamplePGO #76532
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Add support for SamplePGO #76532
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This is meant to match clang's `-fprofile-sample-use=` and accepts a file with the same format. rdar://135443278
This achieves the same as clang's `-fdebug-info-for-profiling`, which emits DWARF discriminators to aid in narrowing-down which basic block corresponds to a particular instruction address. This is particularly useful for sampling-based profiling. rdar://135443278
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Adds the following flags to
swift-frontend:-debug-info-for-profiling, matching clang's-fdebug-info-for-profiling. It includes DWARF discriminators to the debug info so that PC samples can be mapped back to individual basic blocks.-profile-sample-use=<FILE>, matching clang's-fprofile-sample-use=. It takes a sampling-based profile file emitted from llvm-profdata.Currently, these are "frontend only" flags, so you'd need to use
swiftc -Xfrontend -profile-sample-use=...to trigger their functionality.rdar://135443278