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