public void setOutput(PcodeOp op, Varnode vn) {
		if (vn == op.getOutput()) {
			return;			// Output already set to this
		}
		if (op.getOutput() != null) {
			unSetOutput(op);
		}

		if (vn.getDef() != null) {
			unSetOutput(vn.getDef());
		}
		vn = vbank.setDef(vn, op);
		op.setOutput(vn);
	}
return all PcodeOps associated with a particular instruction Address
@param addr -- Address of instruction generating PcodeOps
@return -- Iterator to PcodeOps
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/pcode/PcodeSyntaxTree.java