PR19340: If we see a declaration of a member of an unspecialized class template

that looks like it might be an explicit specialization, don't recover as an
explicit specialization (bypassing the check that would reject that).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206444 91177308-0d34-0410-b5e6-96231b3b80d8