selftests/bpf: Test reported max stack depth

This patch tests the maximum stack depth reporting in verifier logs,
with a couple special cases covered: fastcall, private stacks (main
subprog & callee), and rounding up to 16 bytes. For that last one, we
need to skip the test when JIT compilation is disabled as the rounding
is then to 32 bytes.

Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/075d22efd4338385a92f13b7817025cc3f04ec60.1778700777.git.paul.chaignon@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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