x86-64 Linux musl build segfaults

[dipinhora]

Seen as part of #4522, it seems the x86-64 Linux musl builds result in random segfaults..

some example CI logs from the referenced PR:

• https://github.com/ponylang/ponyc/actions/runs/11223060385/job/31252734889
• https://github.com/ponylang/ponyc/actions/runs/11220047775/job/31187359953
• https://github.com/ponylang/ponyc/actions/runs/11217855902/job/31180337962
• https://github.com/ponylang/ponyc/actions/runs/11223060385/job/31199824525
• https://github.com/ponylang/ponyc/actions/runs/11223060385/job/31196855117

[SeanTAllen]

I tried blowing away the cache of LLVM etc and it had no impact. This started happening "out of the blue" without an obvious change we did. Additionally, the builder image hasnt been updated in a year so effectively "nothing changed" yet this started happening.

[SeanTAllen]

This is no longer happening and we didn't change anything. It's possible this was some weird race condition that was time based. It is possible we were running on broken hardware. "Weird race condition" seems more likely.

At the moment, this isn't reproducible.

[jemc]

We agreed on the sync call to close this ticket for now, because it isn't reproducible anymore.

If it starts happening again later, we can reopen this ticket.