[ProfileSummary] Add options to override hot and cold count thresholds.

Summary:
The hot and cold count thresholds are derived from the summary, but for
debugging purposes it is convenient to provide the actual thresholds.

Reviewers: davidxl

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D54040

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346005 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed