[PATCH] D93073: [llvm-cov gcov] Replace Donald B. Johnson's cycle enumeration with iterative cycle finding

[Fangrui Song via Phabricator via llvm-commits]

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We are essentially performing cycle cancelling. Since we don't actually need to
enumerate every cycle (simple circuit), Donald B. Johnson's cycle enumeration is
unnecessary here. Replace it with a simple cycle finding algorithm.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D93073

Files:
  llvm/include/llvm/ProfileData/GCOV.h
  llvm/lib/ProfileData/GCOV.cpp

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