code: public ConstantNameAndTypeInfo addConstantNameAndType(ConstantUTFInfo nameConstant,
                                                            ConstantUTFInfo descConstant) {
          return (ConstantNameAndTypeInfo)addConstant
              (new ConstantNameAndTypeInfo(nameConstant, descConstant));
      }
docs: Get or create a constant name and type structure from the constant pool.