Hiroshi Yamauchi d842f2eec4 [PGO][CHR] Speed up following long, interlinked use-def chains. ...

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

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

Reviewers: davidxl

Reviewed By: davidxl

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67198

llvm-svn: 371086

2019-09-05 16:56:55 +00:00

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