[Rewrite] Extend to further accept CharSourceRange

Some Rewrite functions are already overloaded to accept
CharSourceRange, and this extends others in the same manner.  I'm
calling these in code that's not ready to upstream, but I figure they
might be useful to others in the meantime.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D61467

llvm-svn: 365258