[Patch] Add the __wchar_t type in MS-compatibility mode (PR15815)

[Hans Wennborg]

On Tue, Apr 23, 2013 at 2:49 PM, Aaron Ballman <aaron at aaronballman.com> wrote:
> LGTM!  This does raise a question for me about whether we properly
> define _WCHAR_T_DEFINED and _NATIVE_WCHAR_T_DEFINED for wchar_t
> inclusion...

There's code to do this in InitPreprocessor.cpp. It doesn't seem to
have any test though. I'll see if I can add one.

Thanks,
Hans