selftests/bpf: BPF test_prog selftests for bpf_loop inlining

Two new test BPF programs for test_prog selftests checking bpf_loop
behavior. Both are corner cases for bpf_loop inlinig transformation:
 - check that bpf_loop behaves correctly when callback function is not
   a compile time constant
 - check that local function variables are not affected by allocating
   additional stack storage for registers spilled by loop inlining

Signed-off-by: Eduard Zingerman <[email protected]>
Acked-by: Song Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

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