ProfileSummaryInfo improvements.

* Add is{Hot|Cold}CallSite methods
* Fix a bug in isHotBB where it was looking for MD_prof on a return instruction
* Use MD_prof data only if sample profiling was used to collect profiles.
* Add an unit test to ProfileSummaryInfo

Differential Revision: https://reviews.llvm.org/D28584



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291878 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed