private void clear() {
		markop.clear();
		markvn.clear();
		vnedge.clear();
		opedge.clear();
	}
Construct a level 0 hash on the input Varnode to the given PcodeOp

The PcodeOp can be raw, no linked into a PcodeSyntaxTree
@param op is the given PcodeOp
@param inputIndex is the index of the input Varnode to hash
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/pcode/DynamicHash.java