Fix an enum-related assert in canonicalization #2812
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Enums can implement types, and that matters now.
The possibility for this problem was introduced with https://dart-review.googlesource.com/c/sdk/+/203564, but it didn't actually become a problem until a field
_namewas added to the Enum class, here: https://dart-review.googlesource.com/c/sdk/+/210480. This tripped an assert in canonicalization because this seemed to be inherited but we didn't haveEnumin our inheritance chain.Fix that by adding type implementation support to the
Enumtype and verifying that Enum gets dropped into the superchain for enums.