libc-test fails with segfault on sparc64-unknown-linux-gnu

[JohnTitor]

E.g. https://github.com/rust-lang/libc/runs/4085650531?check_suite_focus=true:

 qemu-system-sparc64: terminating on signal 15 from pid 1435 (timeout)
OpenBIOS for Sparc64
Configuration device id QEMU version 1 machine id 0
kernel addr 404000 size b267e0
kernel cmdline init=/run_prog.sh
CPUs: 1 x SUNW,UltraSPARC-IIi
UUID: 00000000-0000-0000-0000-000000000000
Welcome to OpenBIOS v1.1 built on Mar 12 2020 14:03
  Type 'help' for detailed information

Segmentation fault

rustc 1.58.0-nightly (e249ce6b2 2021-10-30) doesn't fail but rustc 1.58.0-nightly (db062de72 2021-11-01) does.

[JohnTitor]

#2503 removed the failure, closing.