[llvm] [BPF] Visit nested map array during BTF generation (PR #150608)

[via llvm-commits]

mtardy wrote:

> Could you please fix the following tests:
> 
> ```
> Failed Tests (3):
>   LLVM :: CodeGen/BPF/BTF/map-def-2.ll
>   LLVM :: CodeGen/BPF/BTF/map-def-3.ll
>   LLVM :: CodeGen/BPF/BTF/map-def-nested-array.ll
> ```
> 
> Some reordering is because of my changes in patch #1? Probably would be nice to switch `map-def-{2,3}.ll` to `./llvm/test/CodeGen/BPF/BTF/print_btf.py`.

Ah yep I missed this indeed! This should be fixed now and I migrated the tests to use `print_btf.py`.

https://github.com/llvm/llvm-project/pull/150608