Detects and fixes calls to grand-…parent virtual methods instead of calls to overridden parent’s virtual methods.

struct A {
  int virtual foo() {...}

struct B: public A {
  int foo() override {...}

struct C: public B {
  int foo() override { A::foo(); }
//                     ^^^^^^^^
// warning: qualified name A::foo refers to a member overridden in subclass; did you mean 'B'?  [bugprone-parent-virtual-call]