public int getMutability() {
		return entryList[0].getMutability();
	}
Return one of
   - MutabilitySettingsDefinition.NORMAL
   - MutabilitySettingsDefinition.VOLATILE
   - MutabilitySettingsDefinition.CONSTANT
@return the mutability setting
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/pcode/HighSymbol.java