[IR] Add REINTERPRET_CAST operator in IrTypeOperatorCall

- fix BE
 - fix Serializer
 - implement builder
 - make Ir a bit more type-correct
 - support developer mode (lowering [dynamic]implicit cast meterialized as general cast)
 - fix autoboxing lowering

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFileSerializer.kt

@@ -738,6 +738,8 @@ open class IrFileSerializer(
             ProtoTypeOperator.SAM_CONVERSION
         IrTypeOperator.IMPLICIT_DYNAMIC_CAST ->
             ProtoTypeOperator.IMPLICIT_DYNAMIC_CAST
+        IrTypeOperator.REINTERPRET_CAST ->
+            error("Unreachable execution")
     }
 
     private fun serializeTypeOp(expression: IrTypeOperatorCall): ProtoTypeOp {