[PATCH] D95803: Ensure that InstructionCost actually implements a total ordering

[Christopher Tetreault via Phabricator via llvm-commits]

ctetreau added a comment.

A reasonable way ahead would be to just take the change to operator==, but not the change to operator<. We could explicitly codify "all invalid costs are considered to be equal", and this would basically be equivalent to Optional<int>.


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https://reviews.llvm.org/D95803