[PM] Cleanup a const_cast and other machinery left over in this code
from before I removed thet non-const use of the function.

The unused variable that held the const_cast was already kindly removed
by Michael.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225143 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed