C++ PATCH to implement C++11 inheriting constructors

[Jason Merrill]

This patch implements the C++11 inheriting constructors feature: given

struct A { A(int); };
struct B { using A::A; };

the compiler defines B::B(int) that just passes its argument along to 
the A constructor.

Ville started working on this feature a while back, but got tied up with 
other things and was unable to finish it in time for 4.8, so I finished 
it up.

Tested x86_64-pc-linux-gnu, applying to trunk.
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