[Bug c/124223] Cast (int32_t)0x80000000 causes the whole loop to be optimized away

[schwab--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124223

--- Comment #3 from Andreas Schwab <sch...@linux-m68k.org> ---
signed integer overflow: 2147483392 - -2147483648 cannot be represented in type
'int'