Implement parsing for explicit instantiations of class templates, e.g.,

  template class X<int>;

This also cleans up the propagation of template information through
declaration parsing, which is used to improve some diagnostics.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@71608 91177308-0d34-0410-b5e6-96231b3b80d8
10 files changed