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Implement the cpuv4 register-to-register move with sign extension. It is distinguished from the normal moves by non-zero values in insn->off, which determine the source size. s390x has instructions to deal with all of them: lbr, lhr, lgbr, lghr and lgfr. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Link: https://lore.kernel.org/r/20230919101336.2223655-5-iii@linux.ibm.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>