Enable correcting a member declaration where the type is class template,

and the class name is shadowed by another member. Recovery still needs
to be figured out, which is non-trivial since the parser has already gone
down a much different path than if it had recognized the class template
as type instead of seeing the member that shadowed the class template.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@201360 91177308-0d34-0410-b5e6-96231b3b80d8