Upgrade LLVM to latest release

### Describe the feature you'd like supported

Use latest LLVM release, but currently optimizations break verification.
Blocked on working with the LLVM bpf maintainers.

### Proposed solution

Probably need changes in LLVM per discussion at LSF/MM/BPF.

### Additional context

_No response_

The issue names no files, tests, or entry points. Start with the LSF/MM/BPF discussion and coordination with the LLVM BPF maintainers; the work is done only when the latest LLVM release can be used without breaking verification.

Written by the indexing model from the issue text.