target-arm: A64: Implement WFI
Implement the WFI instruction for A64; this just involves wiring up the instruction, and adding a gen_a64_set_pc_im() which was accidentally omitted from the A64 decoder top loop. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com>
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