When comparing two template template arguments in the template differ, consider

When comparing two template template arguments in the template differ, consider
them the same if they are actually the same; having the same name isn't enough.

Similar to r174013, template template arguments were also mistakenly considered
the same when they had the same name but were in different namespaces.
In addition, when printing template template arguments, use the qualified name
if the regular name is the same.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174029 91177308-0d34-0410-b5e6-96231b3b80d8