avm2: Rework representation of not-null and is-null in the optimizer #22047
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Values that are guaranteed to be null are now represented by having their `constant_value` be `ConstantValue::Null`. Values that are guaranteed to not be null or undefined are now represented by setting their `not_null` property to `true`.
Lord-McSweeney
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A-avm2
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Also add two misc tests, one failing and one passing