r203624 - Be case sensitive when determining driver mode based on argv[0] except on Windows

[Anton Korobeynikov]

>    std::string ProgName(llvm::sys::path::stem(ArgVector[0]));
> +#ifdef _WIN32
It should definitely be LLVM_ON_WIN32 here

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With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University