Fix loplugin:unnecessaryoverride

(user-provided virtual dtor in class with dependent base)

Change-Id: I37b3cc3d32e76a0286ecc91f999920e3dfe706cc

compilerplugins/clang/test/unnecessaryoverride-dtor.hxx

@@ -46,6 +46,10 @@ struct MarkedInlineButNotDefined {
     inline ~MarkedInlineButNotDefined();
 };
 
+template<typename T> struct TemplateBase: T {
+    virtual ~TemplateBase() {}
+};
+
 #endif
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */

compilerplugins/clang/unnecessaryoverride.cxx

@@ -143,6 +143,10 @@ bool UnnecessaryOverride::VisitCXXMethodDecl(const CXXMethodDecl* methodDecl)
                         return true;
                     }
                 }
+                else
+                {
+                    return true; // dependent base
+                }
             }
         }
         // corner case