bpf/tests: Add 32 bits only long conditional jump tests

Commit f1517eb7 ("bpf/tests: Expand branch conversion JIT test")
introduced "Long conditional jump tests" but due to those tests making
use of 64 bits DIV and MOD, they don't get jited on powerpc/32,
leading to the long conditional jump test being skiped for unrelated
reason.

Add 4 new tests that are restricted to 32 bits ALU so that the jump
tests can also be performed on platforms that do no support 64 bits
operations.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/609f87a2d84e032c8d9ccb9ba7aebef893698f1e.1736154762.git.christophe.leroy@csgroup.eu