[PATCH] Add __builtin_addressof

[Richard Smith]

The attached patch adds a __builtin_addressof, that performs the same
functionality as the built-in & operator (ignoring any overloaded
operator& for the type). The purpose of this builtin is for use in
std::addressof, to allow it to be made constexpr; the existing
implementation technique (reinterpret_cast to some reference type,
take address, reinterpert_cast back) does not permit this because
reinterpret_cast between reference types is not permitted in a
constant expression in C++11 onwards.

Any objections?
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