private void setLabel(OpTpl op) {
		if (labeldef == null) {
			labeldef = new ArrayList<>();
		}
		int labelindex = (int) op.getInput()[0].getOffset().getReal() + labelbase;
		while (labeldef.size() <= labelindex) {
			labeldef.add(null);
		}
		labeldef.set(labelindex, numOps);
	}
Make a note of the current op index, and associate
it with the label index from the label template,
so that the label can later be resolved to a relative
address by resolveRelatives
@param op = the label template op
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/processors/sleigh/PcodeEmit.java