[PATCH] D121142: [CSSPGO][llvm-profgen] Turn on CS nested profile generation by default.

[Hongtao Yu via Phabricator via llvm-commits]

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CS nested profile has a benefit over the CS flat profile that is to speed up the build while achieve an on-par or slighlty better performance. I'm turning it on be default for CSSPGO.

Test Plan:


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121142

Files:
  llvm/test/tools/llvm-profgen/cs-extbinary.test
  llvm/test/tools/llvm-profgen/cs-interrupt.test
  llvm/test/tools/llvm-profgen/cs-preinline.test
  llvm/test/tools/llvm-profgen/fname-canonicalization.test
  llvm/test/tools/llvm-profgen/func-split.test
  llvm/test/tools/llvm-profgen/inline-cs-noprobe.test
  llvm/test/tools/llvm-profgen/inline-cs-pseudoprobe.test
  llvm/test/tools/llvm-profgen/merge-cold-profile.test
  llvm/test/tools/llvm-profgen/multi-load-segs.test
  llvm/test/tools/llvm-profgen/noinline-cs-noprobe.test
  llvm/test/tools/llvm-profgen/noinline-cs-pseudoprobe.test
  llvm/test/tools/llvm-profgen/recursion-compression-noprobe.test
  llvm/test/tools/llvm-profgen/recursion-compression-pseudoprobe.test
  llvm/test/tools/llvm-profgen/separate-debuginfo-binary.test
  llvm/test/tools/llvm-profgen/truncated-pseudoprobe.test
  llvm/tools/llvm-profgen/ProfileGenerator.cpp

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