public Varnode findVarnode(int sz, Address addr, SequenceNumber sq) {
		return vbank.find(sz, addr, sq.getTarget(), sq.getTime());
	}
return Varnode of given size and starting Address defined by a PcodeOp
with a given SequenceNumber
@param sz -- size of Varnode
@param addr -- starting Address of Varnode
@param sq -- SequenceNumber of PcodeOp defining the Varnode
@return -- the Varnode
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/pcode/PcodeSyntaxTree.java