[WASM] Add std methods for collections

kotlin-native/runtime/src/main/kotlin/kotlin/collections/ArrayUtil.kt

@@ -22,22 +22,6 @@ internal inline fun <E> arrayOfUninitializedElements(size: Int): Array<E> {
     return Array<E>(size)
 }
 
-
-/**
- * Returns a new array which is a copy of the original array with new elements filled with null values.
- */
-internal fun <E> Array<E>.copyOfNulls(newSize: Int): Array<E?>  = copyOfNulls(0, newSize)
-
-internal fun <E> Array<E>.copyOfNulls(fromIndex: Int, toIndex: Int): Array<E?> {
-    val newSize = toIndex - fromIndex
-    if (newSize < 0) {
-        throw IllegalArgumentException("$fromIndex > $toIndex")
-    }
-    val result = @Suppress("TYPE_PARAMETER_AS_REIFIED") arrayOfNulls<E>(newSize)
-    this.copyInto(result, 0, fromIndex, toIndex.coerceAtMost(size))
-    return result
-}
-
 /**
  * Copies elements of the [collection] into the given [array].
  * If the array is too small, allocates a new one of collection.size size.