new loplugin: find write-only fields

Change-Id: I0f83939babacf92485420ee63f290a297d7cb717
Reviewed-on: https://gerrit.libreoffice.org/22498
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>

compilerplugins/clang/plugin.cxx

@@ -104,6 +104,7 @@ class ParentBuilder
         bool VisitFunctionDecl( const FunctionDecl* function );
         bool VisitObjCMethodDecl( const ObjCMethodDecl* method );
         void walk( const Stmt* stmt );
+        bool shouldVisitTemplateInstantiations () const { return true; }
         unordered_map< const Stmt*, const Stmt* >* parents;
     };