protected void setHighOnInstances() {
		for (Varnode instance : instances) {
			if (instance instanceof VarnodeAST) {
				((VarnodeAST) instance).setHigh(this);
			}
		}
	}
Link Varnodes directly to this HighVariable
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/pcode/HighVariable.java