closure crashes in qsort on s390x

[tankf33der]

Describe the bug

• only Debian-Ubuntu crash inside qsort()
• Alpine Linux - ok (!)
• all rest closures - ok
• whole vlib/v/tests/ - ok except this one crash

Reproduction Steps

./v test vlib/v/tests/fns/closure_fn_arg_in_map_test.v  

Expected Behavior

OK.

Current Behavior

Crash inside qsort().

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.10 b76b1ee

Environment details (OS name and version, etc.)

mpech@debian:~/v$ ./v doctor
|V full version      |V 0.4.10 b76b1ee76328ce62a6a7e149f89b83ba786ad603.b76b1ee
|:-------------------|:-------------------
|OS                  |linux, Debian GNU/Linux 12 (bookworm)
|Processor           |2 cpus, 64bit, big endian, s390x
|Memory              |1.5GB/1.95GB
|                    |
|V executable        |/home/mpech/v/v
|V last modified time|2025-04-22 13:55:54
|                    |
|V home dir          |OK, value: /home/mpech/v
|VMODULES            |OK, value: /home/mpech/.vmodules
|VTMP                |OK, value: /tmp/v_1000
|Current working dir |OK, value: /home/mpech/v
|                    |
|Git version         |git version 2.39.5
|V git status        |weekly.2025.16-33-gb76b1ee7-dirty (50 commit(s) behind V master)
|.git/config present |true
|                    |
|cc version          |cc (Debian 12.2.0-14) 12.2.0
|gcc version         |gcc (Debian 12.2.0-14) 12.2.0
|clang version       |N/A
|tcc version         |N/A
|tcc git status      |thirdparty-unknown-unknown de82a130
|emcc version        |N/A
|glibc version       |ldd (Debian GLIBC 2.36-9+deb12u10) 2.36

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