[Bug c++/85091] Compiler generates different code depending on whether -Wnonnull -Woverloaded-virtual given or not

[vz-gcc at zeitlins dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85091

--- Comment #21 from Vadim Zeitlin <vz-gcc at zeitlins dot org> ---
Created attachment 43774
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43774&action=edit
Reduced test case showing the problem with native g++ 7.3