David Blaikie c7aaacde67 Allow Optionals to be compared to None ...

This is something like nullopt in std::experimental::optional. Optional
could already be constructed from None, so this seems like an obvious
extension from there.

I have a use in a future patch for Clang, though it may not go that
way/end up used - so this seemed worth committing now regardless.

llvm-svn: 245518

2015-08-19 23:07:27 +00:00

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