Rename ExitCount to BackedgeTakenCount, because that's what it is.

We called a variable ExitCount, stored the backedge count in it, then redefined it to be the exit count again.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247140 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed