[clang] [llvm] [BPF] Do atomic_fetch_*() pattern matching with memory ordering (PR #107343)

[via llvm-commits]

yonghong-song wrote:

Uploaded new codes to address the missing case like
```
int _Atomic __attribute__((btf_type_tag("foo"))) *root;
```

https://github.com/llvm/llvm-project/pull/107343