@Override
		public int hashCode() {
			long value = resolvedDt.getKey();
			return (int) (value ^ (value >>> 32));
		}
Set of {@link AbstractIntegerDataType} IDs whose removal has been blocked
to allow persistence of defined bitfields.  
See {@link #blockDataTypeRemoval(AbstractIntegerDataType)}
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/DataTypeManagerDB.java