[PATCH] D54212: [PGO] early exit if all count values are zero

[Rong Xu via Phabricator via llvm-commits]

xur updated this revision to Diff 173006.
xur added a comment.

Add a testcase.


https://reviews.llvm.org/D54212

Files:
  lib/Transforms/Instrumentation/PGOInstrumentation.cpp
  test/Transforms/PGOProfile/Inputs/func_entry.proftext
  test/Transforms/PGOProfile/func_entry.ll

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