Introduce a single reg version of maybe_emit_mod() and factor out
common code in more cases.
Signed-off-by: NJie Meng <jmeng@fb.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Acked-by: NSong Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20211006194135.608932-1-jmeng@fb.com