Improve libclang indexing support for class template specializations
in a few related ways:

  - Don't recurse into instantiations of templates.
  - Recurse into explicit specializations.
  - Visit the template arguments of an explicit specialization or
    explicit instantiation.
  - Include template specialization arguments in the USRs for class
    template specializations.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@112720 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed