[CONCEPTS] Add diagnostic; invalid tag when concept specified

Summary: Adding check to emit diagnostic for invalid tag when concept is specified and associated tests.

Reviewers: rsmith, hubert.reinterpretcast, fraggamuffin, faisalv, aaron.ballman

Subscribers: aaron.ballman, cfe-commits

Differential Revision: http://reviews.llvm.org/D11916

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@245123 91177308-0d34-0410-b5e6-96231b3b80d8