bpf, tests: Add tests for ALU operations implemented with function calls
32-bit JITs may implement complex ALU64 instructions using function calls. The new tests check aspects related to this, such as register clobbering and register argument re-ordering. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210809091829.810076-9-johan.almbladh@anyfinetworks.com
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