[Bug target/112112] Improper Arithmetic Type Conversion in s390x-linux-gnu-gcc

[22s302h0659 at sonline20 dot sen.go.kr via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112112

--- Comment #6 from 김대영 <22s302h0659 at sonline20 dot sen.go.kr> ---
```
z3rodae0@z3rodae0:~$ ./sh.sh
result for -O0 "signed" = 1
result for -O1 "signed" = 1
result for -O2 "signed" = 1
result for -O3 "signed" = 1
result for -O0 "unsigned" = 0
result for -O1 "unsigned" = 0
result for -O2 "unsigned" = 0
result for -O3 "unsigned" = 0
result for -O0 "" = 1
result for -O1 "" = 1
result for -O2 "" = 1
result for -O3 "" = 1
```

That's correct. I ran your code and script in my environment, and it produced
the same results