Extend libclang with a new cursor kind that indicates a reference to a

Extend libclang with a new cursor kind that indicates a reference to a
template. Such cursors occur, for example, in template specialization
types such as vector<int>. Note that we do not handle the
super-interesting case where the template name is unresolved, e.g.,
within a template.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@112636 91177308-0d34-0410-b5e6-96231b3b80d8