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Move all arguments into output registers from input registers. This path is exercised by test_verifier.c's "calls: two calls with args" test. Adjust BPF_TAILCALL_PROLOGUE_SKIP as needed. Let's also make the prologue length a constant size regardless of the combination of ->saw_frame_pointer and ->saw_tail_call settings. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>