castTo

Casts this into the stage result type of outClazz.

Note that the conversion constraints are different from the matrix stated in StageResult. In general:

• outClazz == DontCare::class: Returns DontCare

• outClazz == Undefined::class: Returns Undefined

• outClazz == StageResult.Any::class: Returns this converted by StageResult.asAnyResult

• outClazz == this::class: Returns this

All other conversions are invalid and throws IllegalArgumentException.