btf__parse_raw
LIBBPF_API struct btf *btf__parse_raw(const char *path);
new_btf = btf__parse_raw(btf_kind_file1);
new_btf = btf__parse_raw(btf_kind_file2);
new_btf = btf__parse_raw(btf_kind_file3);
btf = btf__parse_raw("resolve_btfids.test.o.BTF");