rexcode/arm32: VMOV (ARM core register to scalar) Dd[lane], Rt

New VMOV_LANE_8/16/32 encodings: Dd at bits 19:16+bit7, lane bits per
element size (.8 = bit21:bit6:bit5 with bit22 size marker; .16 =
bit21:bit6 with bit5 marker; .32 = bit21). Verify round-trips all three
sizes; spot-checked .8 byte-exact incl. max lane; 600 tests green.
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