[cfe-dev] Unicode path handling on Windows

[Nikola Smiljanic]

I think I got it this time. I realized that ::open and ::stat work just fine
with multibyte paths on windows so there's no need to change this code. The
only problem is llvm::sys::fs module which falsely assumes that input
strings are UTF8 encoded when they are in fact multibyte strings.

Now I really hope I haven't broken anything because llvm::sys::fs::exists is
called in a number of places, but I'm guessing that none of the paths that
are passed to it are really UTF8?

I think entire llvm::sys::fs module should be changed to use
MultibyteToUTF16 instead of UTF8ToUTF16 before calling windows api functions
(unless somebody knows that we actually have UTF8 paths on windows somewhere
in the code)?
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