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Add test coverage for union argument support using fexit programs: * 8B union argument - verify that the verifier accepts it and that fexit programs can trace such functions. * 16B union argument - verify that the verifier accepts it and that fexit programs can access the argument, which is passed using two registers. Signed-off-by: Leon Hwang <leon.hwang@linux.dev> Link: https://lore.kernel.org/r/20250919044110.23729-3-leon.hwang@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>