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.