Add COP insns and allocate struct bpf_stack.
Spaces.
Pack wirelen and cop ptr into bpf_aux_arg struct.
Switch to bpf_args and bpf_ctx. All tests pass.
Init X if a program contains BPF_COPX instruction.
Implement BPF_COP. All existing tests pass.
Update copyright years.
Merge branch 'master' into coprocessor
Merge branch 'master' into coprocessor
Implement BPF_COPX.