[PATCH] D67198: [PGO][CHR] Speed up following long, interlinked use-def chains.

[Hiroshi Yamauchi via Phabricator via llvm-commits]

yamauchi created this revision.
yamauchi added a reviewer: davidxl.
Herald added a project: LLVM.

Avoid visiting an instruction more than once by using a map.

This is similar to https://reviews.llvm.org/rL361416.


Repository:
  rL LLVM

https://reviews.llvm.org/D67198

Files:
  lib/Transforms/Instrumentation/ControlHeightReduction.cpp
  test/Transforms/PGOProfile/chr.ll

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