selftests/bpf: Add tests for rejection of ALU ops with negative offsets

Define a simple program using MOD, DIV, ADD instructions,
make sure that the program is rejected if invalid offset
field is used for instruction.

These are test cases for
commit 55c0ced5 ("bpf: Reject negative offsets for ALU ops")
Link: https://lore.kernel.org/all/tencent_70D024BAE70A0A309A4781694C7B764B0608@qq.com/


Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>