code: static ConstantNameAndTypeInfo make(ConstantPool cp, 
                                          String name,
                                          Descriptor type) {
          ConstantInfo ci = new ConstantNameAndTypeInfo(cp, name, type);
          return (ConstantNameAndTypeInfo)cp.addConstant(ci);
      }
docs: Will return either a new ConstantNameAndTypeInfo object or one
  already in the constant pool.
  If it is a new ConstantNameAndTypeInfo, it will be inserted
  into the pool.