static JitOp stubOp(PcodeOp op) {
		if (op instanceof NopPcodeOp) {
			return new JitNopOp(op);
		}
		return switch (op.getOpcode()) {
			case PcodeOp.UNIMPLEMENTED -> new JitUnimplementedOp(op);
			default -> throw new UnsupportedOperationException(
				"Unrecognized stub op: " + op.getMnemonic());
		};
	}
Create a use-def node for a nop or unimplemented op.

@param op the p-code op
@return the use-def node
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/emu/jit/op/JitOp.java