[swift-evolution] [Proposal] Refine SE-0015 (Tuple Comparison Operators) to include empty case

[Arjun Nayini]

I propose adding support for using comparison operators on the empty tuple.  This is an extension of SE-0015.
 <https://github.com/apple/swift-evolution/blob/master/proposals/0015-tuple-comparison-operators.md>
 <https://github.com/apple/swift-evolution/blob/master/proposals/0015-tuple-comparison-operators.md>
This fixes SR-4172 <https://bugs.swift.org/browse/SR-4172> and the use case is described in the comments of the bug.

The PR has been approved and lives here: https://github.com/apple/swift/pull/8354 <https://github.com/apple/swift/pull/8354>.



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