[PM] Switch tihs code to use a range based for loop over the function.

We can't switch the loop over the instructions because it needs to
early-increment the iterator.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226996 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed