Use non-intrusive refcounting for LangOptions

This type is only refcounted in a couple of places so making ownership explicit
improves clarity.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@212387 91177308-0d34-0410-b5e6-96231b3b80d8
Use non-intrusive refcounting for TargetOptions

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@212388 91177308-0d34-0410-b5e6-96231b3b80d8