Revert "Add const to some Type* parameters which didn't need to be mutable.  NFC."

This reverts commit r243146.

Feedback from Craig Topper and David Blaikie was that we don't put const on Type as it has no mutable state.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243282 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed