public void setInput(PcodeOp op, Varnode vn, int slot) {
		if (slot >= op.getNumInputs()) {
			op.setInput(null, slot);					// Expand number of inputs as necessary
		}
		if (op.getInput(slot) != null) {
			unSetInput(op, slot);
		}
		if (vn != null) {
			VarnodeAST vnast = (VarnodeAST) vn;
			vnast.addDescendant(op);
			op.setInput(vnast, slot);
		}
	}
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