Replace is Array<T> with .isArrayOf<T>()

compiler/testData/codegen/boxWithStdlib/toArray/copyToArray.kt

@@ -2,7 +2,7 @@ import java.util.Arrays
 
 fun box(): String {
     val array = Arrays.asList(2, 3, 9).toTypedArray()
-    if (array !is Array<Int>) return array.javaClass.toString()
+    if (!array.isArrayOf<Int>()) return array.javaClass.toString()
 
     val str = Arrays.toString(array)
     if (str != "[2, 3, 9]") return str

compiler/testData/codegen/boxWithStdlib/toArray/toArray.kt

@@ -0,0 +1,21 @@
+import java.util.Arrays
+
+class MyCollection<T>(val delegate: Collection<T>): Collection<T> by delegate
+
+fun box(): String {
+    val collection = MyCollection(Arrays.asList(2, 3, 9)) as java.util.Collection<*>
+
+    val array1 = collection.toArray()
+    val array2 = collection.toArray(arrayOfNulls<Int>(3) as Array<Int>)
+
+    if (!array1.isArrayOf<Any>()) return (array1 as Object).getClass().toString()
+    if (!array2.isArrayOf<Int>()) return (array2 as Object).getClass().toString()
+
+    val s1 = Arrays.toString(array1)
+    val s2 = Arrays.toString(array2)
+
+    if (s1 != "[2, 3, 9]") return "s1 = $s1"
+    if (s2 != "[2, 3, 9]") return "s2 = $s2"
+
+    return "OK"
+}

compiler/testData/codegen/boxWithStdlib/toArray/toArrayAlreadyPresent.kt

@@ -0,0 +1,36 @@
+import java.util.Arrays
+
+class MyCollection<T>(val delegate: Collection<T>): Collection<T> by delegate {
+    public fun toArray(): Array<Any?> {
+        val a = arrayOfNulls<Any?>(3)
+        a[0] = 0
+        a[1] = 1
+        a[2] = 2
+        return a
+    }
+    public fun <E> toArray(array: Array<E>): Array<E> {
+        val asIntArray = array as Array<Int>
+        asIntArray[0] = 0
+        asIntArray[1] = 1
+        asIntArray[2] = 2
+        return array
+    }
+}
+
+fun box(): String {
+    val collection = MyCollection(Arrays.asList(2, 3, 9)) as java.util.Collection<*>
+
+    val array1 = collection.toArray()
+    val array2 = collection.toArray(arrayOfNulls<Int>(3) as Array<Int>)
+
+    if (!array1.isArrayOf<Any>()) return (array1 as Object).getClass().toString()
+    if (!array2.isArrayOf<Int>()) return (array2 as Object).getClass().toString()
+
+    val s1 = Arrays.toString(array1)
+    val s2 = Arrays.toString(array2)
+
+    if (s1 != "[0, 1, 2]") return "s1 = $s1"
+    if (s2 != "[0, 1, 2]") return "s2 = $s2"
+
+    return "OK"
+}