Null-safe numbers: separate legacy and null-safe number promotion. The new number promotion rules for null safety (https://github.com/dart-lang/language/blob/master/accepted/future-releases/nnbd/number-operation-typing.md) are different enough from the old ones that it makes sense to implement them separately. As a first step toward that, this CL separates the existing logic into legacy and null-safe variants. Bug: https://github.com/dart-lang/sdk/issues/42629 Change-Id: I0d52ce7366e34d5e0d176a0e14f4bc55f5541c04 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/158460 Commit-Queue: Paul Berry <paulberry@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
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