Refactored tests using Array constructor:

Some moved to tests with stdlib
Some changed to use arrayOfNulls

compiler/testData/codegen/box/toArray/toArray.kt

@@ -6,7 +6,7 @@ fun box(): String {
     val collection = MyCollection(Arrays.asList(2, 3, 9)) as java.util.Collection<*>
 
     val array1 = collection.toArray()
-    val array2 = collection.toArray(Array<Int>(3, { 0 }))
+    val array2 = collection.toArray(arrayOfNulls<Int>(3) as Array<Int>)
 
     if (array1 !is Array<Any>) return (array1 as Object).getClass().toString()
     if (array2 !is Array<Int>) return (array2 as Object).getClass().toString()