[Bug c/108439] incorrect optimization with -O2, -O3, -Os

[georgmueller at gmx dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108439

--- Comment #2 from Georg Müller <georgmueller at gmx dot net> ---
Just a small additional note: The dependency on argc in the loop filling the
array in main() is only there to avoid early optimization.