[PGO] fix a bug in profile summary computation

Entry block count was not counted and is corrected. Also
introduce a new metric that is MaxInternalBlockCount which
show command shows (as before).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257987 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed