Add missing unsigned array constructors (from size)

#KT-25961 Fixed

libraries/stdlib/unsigned/src/kotlin/UIntArray.kt

@@ -14,6 +14,9 @@ public inline class UIntArray
 @PublishedApi
 internal constructor(private val storage: IntArray) : Collection<UInt> {
 
+    /** Creates a new array of the specified [size], with all elements initialized to zero. */
+    public constructor(size: Int) : this(IntArray(size))
+
     /** Returns the array element at the given [index]. This method can be called using the index operator. */
     public operator fun get(index: Int): UInt = storage[index].toUInt()