@Override
	public Reference[] getOperandReferences(int opIndex) {
		if (refMgr == null)
			return emptyMemRefs;
		return refMgr.getReferencesFrom(address, opIndex);
	}
Get the references for the operand index. If the operand type is a
register, then the user defined references are returned; otherwise an
array with the address for the operand value is returned.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/util/PseudoCodeUnit.java