[PATCH] Implement DR136

[David Majnemer]

The attached patch implements DR136 [*], "Default arguments and friend
functions."

The crux of this issue is that a function declaration that specifies a
default argument must define the function and be it's only declaration.

[*] http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#136

-- 
David Majnemer
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