[Bug tree-optimization/118634] [15 Regression] missed optimization leading to maybe-uninitiallized warning

[phosit at autistici dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118634

--- Comment #2 from Phosit <phosit at autistici dot org> ---
When unrolling is forbidden by `#pragma GCC unroll 0` there is no warning.