void setHighVariable(HighVariable high) {
		if (highVariable != null) {
			if (highVariable.getSize() >= high.getSize()) {
				return;
			}
		}
		highVariable = high;
	}
Associate a particular HighVariable with this symbol. This is used to link the symbol
into the decompiler's description of how a function manipulates a particular symbol.
Multiple partial HighVariables may get associated with the same HighSymbol.  The HighSymbol
keeps a reference to the biggest HighVariable passed to this method.
@param high is the associated HighVariable
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/pcode/HighSymbol.java