Parse: Template specializations which aren't dependent needn't have their parsing be delayed

Summary:
We should treat a non-dependent template specialization like it wasn't
templated at all.

Reviewers: rsmith

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1554

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190743 91177308-0d34-0410-b5e6-96231b3b80d8