Add missing unsigned array constructors (from size)

#KT-25961 Fixed

libraries/stdlib/test/collections/UnsignedArraysTest.kt

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package test.collections
+
+import kotlin.test.*
+
+class UnsignedArraysTest {
+
+    @Test
+    fun ubyteArrayInit() {
+        val zeroArray = UByteArray(42)
+        assertEquals(42, zeroArray.size)
+        for (index in zeroArray.indices) {
+            assertEquals(0u, zeroArray[index])
+        }
+
+        val initArray = UByteArray(42) { it.toUByte() }
+        for (index in initArray.indices) {
+            assertEquals(index.toUByte(), initArray[index])
+        }
+    }
+    
+    @Test
+    fun ushortArrayInit() {
+        val zeroArray = UShortArray(42)
+        assertEquals(42, zeroArray.size)
+        for (index in zeroArray.indices) {
+            assertEquals(0u, zeroArray[index])
+        }
+
+        val initArray = UShortArray(42) { it.toUShort() }
+        for (index in initArray.indices) {
+            assertEquals(index.toUShort(), initArray[index])
+        }
+    }
+    
+    @Test
+    fun uintArrayInit() {
+        val zeroArray = UIntArray(42)
+        assertEquals(42, zeroArray.size)
+        for (index in zeroArray.indices) {
+            assertEquals(0u, zeroArray[index])
+        }
+
+        val initArray = UIntArray(42) { it.toUInt() }
+        for (index in initArray.indices) {
+            assertEquals(index.toUInt(), initArray[index])
+        }
+    }
+    
+    @Test
+    fun ulongArrayInit() {
+        val zeroArray = ULongArray(42)
+        assertEquals(42, zeroArray.size)
+        for (index in zeroArray.indices) {
+            assertEquals(0u, zeroArray[index])
+        }
+
+        val initArray = ULongArray(42) { it.toULong() }
+        for (index in initArray.indices) {
+            assertEquals(index.toULong(), initArray[index])
+        }
+    }
+}