selftests/bpf: Verify copy_register_state() preserves parent/live fields
[ Upstream commit b9fa9bc8 ] A testcase to check that verifier.c:copy_register_state() preserves register parentage chain and livness information. Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20230106142214.1040390-3-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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