Method noInterveningStatement

\brief Check for values created in \b this block that flow outside the block. The block can calculate a value for a BRANCHIND or CBRANCH and can copy values and this method will still return \b true. But calculating any value used outside the block, writing to an addressable location, or performing a CALL or STORE causes the method to return \b false. \return \b true if no value is created that