Fix ASSIGN_STATIC_PROP_REF type inference

We were not inferring anything for the ASSIGN_STATIC_PROP_REF
result type at all, leaving it as an empty type. In the test
case this results

Fix ASSIGN_STATIC_PROP_REF type inference

We were not inferring anything for the ASSIGN_STATIC_PROP_REF
result type at all, leaving it as an empty type. In the test
case this results in a live range being incorrectly eliminated,
but this could break in all kinds of other ways as well..

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