selftests/bpf: Add tests for add_const

Improve arena based tests and add several C and asm tests
with specific pattern.
These tests would have failed without add_const verifier support.

Also add several loop_inside_iter*() tests that are not related to add_const,
but nice to have.

Signed-off-by: Alexei Starovoitov <>
Signed-off-by: Daniel Borkmann <>
2 files changed