[Bug rtl-optimization/69789] g++ -O2 is removing tests against a variable that can be changed

[tmark at isc dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69789

--- Comment #1 from Thomas Markwalder <tmark at isc dot org> ---
Created attachment 37676
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37676&action=edit
compressed compilation temp file