Sema: Diagnose improper application of inheritance keywords

We would previously allow inappropriate inheritance keywords to appear
on class declarations.  We would also allow inheritance keywords on
templates which were not fully specialized; this was divergent from
MSVC.

Differential Revision: http://llvm-reviews.chandlerc.com/D2585


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@200423 91177308-0d34-0410-b5e6-96231b3b80d8
Consolidating several table-generated files containing parser-related string switches into a single file. This reduces build-related complexity by replacing four separate projects (and table-gen instantiations) with a single one.

No functional changes intended.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@200424 91177308-0d34-0410-b5e6-96231b3b80d8