Fix for verifier error on arm64

[javierhonduco]

See comments for more details. Not sure what commits changed the behaviour but this hack works around this issue.

cc @gmarler as we discussed that in our arm64 Lima boxes the BPF code failed to load. We still need to do some work to make the unwinder work in arm64, but at least this should unblock testing that the BPF program can load at all!

Some things we should do:

• report this upstream (bisect the code change in the kernel);
• add the BPF code as part of the kernel BPF integration tests;
• add kernel tests for both arm64 (requested access to the preview for arm64 Actions workers, to not have to emulate arm64 which is quite slow in the already overloaded Actions machines) and x86_64 (I started it in this branch);