There is no need to use `--check-prefix` multiple times.
It helps to improve readability/test maintainability.
This patch does it for all tools at once.
Differential revision: https://reviews.llvm.org/D78217
Add overlap functionality to llvm-profdata tool to compute the similarity
between two profile files.
Differential Revision: https://reviews.llvm.org/D60977
llvm-svn: 359612