protected void applyU4Data(Address addr) {
		try {
			program.getListing().createData(addr, DWordDataType.dataType);
		}
		catch (CodeUnitInsertionException e) {
			// ignore
		}
	}
Check for a Data pointer at the specified address and return the referenced
address.
@param addr address of stored pointer
@return pointer referenced address or null if no pointer found
Ghidra/Features/Base/src/main/java/ghidra/test/processors/support/PCodeTestAbstractControlBlock.java