bpf: generalize is_branch_taken() to work with two registers

While still assuming that second register is a constant, generalize
is_branch_taken-related code to accept two registers instead of register
plus explicit constant value. This also, as a side effect, allows to
simplify check_cond_jmp_op() by unifying BPF_K case with BPF_X case, for
which we use a fake register to represent BPF_K's imm constant as
a register.

Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Link: https://lore.kernel.org/r/20231102033759.2541186-13-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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