[Bug tree-optimization/90949] [9 Regression] null pointer check removed

[david.bolvansky at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90949

--- Comment #16 from Dávid Bolvanský <david.bolvansky at gmail dot com> ---
For -O3 it is okay, but for -O2 this is questionable