[ADT] Make Optional a literal type.
This allows returning Optional values from constexpr contexts. Reviewed By: fhahn, dblaikie, rjmccall Differential Revision: https://reviews.llvm.org/D86354
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This allows returning Optional values from constexpr contexts. Reviewed By: fhahn, dblaikie, rjmccall Differential Revision: https://reviews.llvm.org/D86354