public void unSetOutput(PcodeOp op) {
		Varnode vn = op.getOutput();
		if (vn == null) {
			return;		// Nothing to do
		}
		op.setOutput(null);
		vbank.makeFree(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