[llvm] [BPF] Define empty set of BPF libcalls (PR #169537)

[Lucas Ste via llvm-commits]

LucasSte wrote:

> since it would break most rust programs.

Can you explain why this patch will break Rust programs? Can you also provide an example where that is the case?

https://github.com/llvm/llvm-project/pull/169537