[llvm] [BPF] Handle nested wrapper structs in BPF map definition traversal (PR #144097)

[via llvm-commits]

eddyz87 wrote:

@vadorovsky ,

> Unfortunately, the Rust code I used for generating the IR is the simpliest one which reproduces the issue and actually compiles. To be precise, this is the code:

I mean, you can use my C example, it tests the same thing:

```
struct key { int i; };
struct val { int j; };

#define __uint(name, val) int (*name)[val]
#define __type(name, val) typeof(val) *name

struct {
        __uint(type, 1);
        __uint(max_entries, 1);
        __type(key, struct key);
        __type(value, struct val);
} map __attribute__((section(".maps")));
```

https://github.com/llvm/llvm-project/pull/144097