[PATCH] D23178: [ADT] Add relation operators for Optional

[Tim Shen via llvm-commits]

timshen created this revision.
timshen added a reviewer: dblaikie.
timshen added a subscriber: llvm-commits.

Make Optional's behavior the same as the coming std::optional.

https://reviews.llvm.org/D23178

Files:
  include/llvm/ADT/Optional.h
  unittests/ADT/OptionalTest.cpp

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