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Fix address_of for overloaded operator& #139

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Fix address_of for overloaded operator& #139

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Fixes #133.

策略：

  • 如果编译器支持 __builtin_addressof 则使用；
  • 否则，使用 SFINAE
    • 对函数使用内建 operator&；
    • 对对象使用 reinterpret_cast 到字节类型再取地址的策略（与 constexpr 不兼容）。

为了避免 addressof<const int>(42) 之类取临时对象的代码通过编译，对右值提供被删除的重载（实现 LWG2598）。

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address_of不能获取对象的真实地址
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