message: Fix aligned new probe for clang 6
diff: int main() {
  struct alignas(__STDCPP_DEFAULT_NEW_ALIGNMENT__ * 4) S {};
  - (void) ::operator new(sizeof(S), std::align_val_t{alignof(S)});
  + (void) ::operator new(sizeof(S), static_cast<std::align_val_t>(alignof(S)));
  }
  