[v3] Implement resolution of DR 630

[Paolo Carlini]

Hi,

tested x86_64-linux, committed to mainline.

-- Jason, while working on this issue, I noticed that:

    valarray<int> v1;
    v1 = { };

compiles just fine in -std=c++0x mode and, for the assignment, ends up
being selected:

    operator=(const Tp&)

with Tp == 0. On the other hand, in C++03 mode, the snippet doesn't
compile at all. Could you please confirm the above is the expected
behavior? Thanks in advance!

Paolo.

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