private void buildOpRefs() {
		oprefmap = new HashMap<>((int) (1.5 * opbank.size()));
		Iterator<?> iter = opbank.allOrdered();
		while (iter.hasNext()) {
			PcodeOp op = (PcodeOp) iter.next();
			oprefmap.put(op.getSeqnum().getTime(), op);
		}
	}
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