[LLVMdev] adding a function to test whether a char is a path separator

[Zhanyong Wan (λx.x x)]

Hi Doug,

While refactoring clang::FileManager to use llvm::sys::path, I had a
need for a function to test whether a char is a path separator.  I
think it would be generally useful.  Would you be able to review it?
You can see http://codereview.appspot.com/4186045 or the attachment.

Thanks,
-- 
Zhanyong
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