failure to find reference to child virtual override in template class

[Jacob-Burckhardt]

When the cursor is on Child::joe definition, rtags-find-references-at-point finds nothing. It should have found the call to joe in main().

template<typename T>
struct Parent {
   virtual void joe()=0;
};

template<typename T>
struct Child : public Parent<T> {
   virtual void joe() {};
};

int main() {
   Child<int> c;
   Parent<int> &p = c;
   p.joe();
}

If modified to remove templates, then it does find the call in main():

struct Parent {
   virtual void joe()=0;
};

struct Child : public Parent {
   virtual void joe() {};
};

int main() {
   Child c;
   Parent &p = c;
   p.joe();
}

#813 might be a related bug.

Environment (please complete the following information):

• OS/Version: Linux (Debian 10.4)
• RTags(rdm,rc): 2.38.131
• Emacs: 26.1
• LLVM/Clang: clang version 8.0.1-3~bpo10+1 (tags/RELEASE_801/final)