libc++: Adding std::bad_array_length

[Marshall Clow]

While reviewing my <dynarray> implementation, Richard pointed out that it should throw bad_array_length if the length was too large.
I tried to do that, only to discover that libc++ didn't have std::bad_array_length.

This patch remedies that (with a test)
There is a corresponding patch for libcxxabi coming.

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki
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