Parses shift directive and returns the parts that would have to be set in the opcode because of it. Does not encode the actual shift amount. It's not an error if there is no shift directive. NB_SHIFT: will be set to 1 iff SHIFT is filled. Note that for rrx, there's no need to fill SHIFT. SHIFT: will be filled in with the shift operand to use, if any. */
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