[Bug sanitizer/92589] heuristic to avoid flexible array members too liberal

[kees at outflux dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92589

--- Comment #8 from Kees Cook <kees at outflux dot net> ---
Created attachment 48153
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48153&action=edit
updated PoC