[dart2js] Consolidate type narrowing logic. Currently _narrowType for TypeInformation nodes has logic to process DartTypes. This logic is a simplified version of the logic in createFromStaticType. We can consolidate the two and just use createFromStaticType directly. And since the static type is only ever used for this type narrowing (and its immutable) we can create the AbstractValue up front and store that instead of the DartType. There was no difference in the emitted JS when tested on 2 large programs. Change-Id: I432279684580edf64ff52254653bd26501d461b7 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/304160 Reviewed-by: Mayank Patke <fishythefish@google.com>
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