[libcxx][RFC] Make (w)cin/(w)cout/(w)cerr works under Windows

[Yi-Hong Lyu via cfe-commits]

Hello all,

According to that Windows mangler takes data type into account. Reference
of std::cin would be translated into ?cin at __1@std@@3V?$basic_istream at DU
?$char_traits at D@__1 at std@@@12 at A (class std::__1::basic_istream<char,struct
std::__1::char_traits<char> > std::__1::cin). Definition of std::cin, in
contrast, would be translated into ?cin at __1@std@@3PADA (char *
std::__1::cin). There is a linking error because two symbols are different.
In the other hand, Itanium mangler doesn't take data type into account.
Either reference or definition of std::cin would be translated into
__ZNSt3__13cinE. To make (w)cin/(w)cout/(w)cerr works under Windows, I
rewrite part of the code under src/iostream.cpp and the patch is attached.
I am wondering whether it would be a appropriate fix for the issue.

Any comment or suggestion is welcomed,
Yi-Hong
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