[PATCH] [WinX86_64 ABI] Handle C99 _Complex as a struct

[Michael Kuperstein]

Regarding mangling, to the best of my understanding, ICC doesn't support _Complex in C++ mode, and since MSVC doesn't support it at all (only C++ std::complex), this issue never arises.
Regarding vectorcall - I'll have to double-check, but I believe the same holds as for the default x64 calling convention, that is, _Complex is treated equivalently to structs.


http://reviews.llvm.org/D7825

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