bpf: use bitfields for simple per-subprog bool flags

We have a bunch of bool flags for each subprog. Instead of wasting bytes
for them, use bitfields instead.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20231204233931.49758-5-andrii@kernel.org


Signed-off-by: Alexei Starovoitov <ast@kernel.org>