Use Array constructor with size to create Array of nulls

Change the constructor visibility from public to private as it should be.

compiler/testData/codegen/box/size/add.kt

@@ -1,6 +1,6 @@
 // TARGET_BACKEND: WASM
 
-// WASM_DCE_EXPECTED_OUTPUT_SIZE: wasm 14_217 
+// WASM_DCE_EXPECTED_OUTPUT_SIZE: wasm 12_295 
 // WASM_DCE_EXPECTED_OUTPUT_SIZE:  mjs  5_579 
 
 // FILE: test.kt

compiler/testData/codegen/box/size/helloWorld.kt

@@ -1,6 +1,6 @@
 // TARGET_BACKEND: WASM
 
-// WASM_DCE_EXPECTED_OUTPUT_SIZE: wasm 49_207 
+// WASM_DCE_EXPECTED_OUTPUT_SIZE: wasm 48_188 
 // WASM_DCE_EXPECTED_OUTPUT_SIZE:  mjs  5_605 
 
 fun box(): String {

compiler/testData/codegen/box/size/helloWorldDOM.kt

@@ -1,6 +1,6 @@
 // TARGET_BACKEND: WASM
 
-// WASM_DCE_EXPECTED_OUTPUT_SIZE: wasm 15_582 
+// WASM_DCE_EXPECTED_OUTPUT_SIZE: wasm 13_660 
 // WASM_DCE_EXPECTED_OUTPUT_SIZE:  mjs  6_134
 
 // FILE: test.kt

compiler/testData/codegen/box/size/ok.kt

@@ -1,6 +1,6 @@
 // TARGET_BACKEND: WASM
 
-// WASM_DCE_EXPECTED_OUTPUT_SIZE: wasm 14_259 
+// WASM_DCE_EXPECTED_OUTPUT_SIZE: wasm 12_337 
 // WASM_DCE_EXPECTED_OUTPUT_SIZE:  mjs  5_451 
 
 fun box() = "OK"

libraries/stdlib/wasm/builtins/kotlin/Array.kt

@@ -14,7 +14,7 @@ import kotlin.wasm.internal.*
  * See [Kotlin language documentation](https://kotlinlang.org/docs/reference/basic-types.html#arrays)
  * for more information on arrays.
  */
-public class Array<T> constructor(size: Int) {
+public class Array<T> @PublishedApi internal constructor(size: Int) {
     internal val storage: WasmAnyArray = WasmAnyArray(size)
 
     @Suppress("TYPE_PARAMETER_AS_REIFIED", "UNUSED_PARAMETER", "CAST_NEVER_SUCCEEDS")
@@ -28,6 +28,7 @@ public class Array<T> constructor(size: Int) {
      * The function [init] is called for each array element sequentially starting from the first one.
      * It should return the value for an array element given its index.
      */
+    // TODO: it have to be inline 
     @Suppress("TYPE_PARAMETER_AS_REIFIED")
     public constructor(size: Int, init: (Int) -> T) : this(size) {
         storage.fill(size, init)

libraries/stdlib/wasm/builtins/kotlin/Library.kt

@@ -30,7 +30,7 @@ public operator fun String?.plus(other: Any?): String = (this ?: "null") + other
  */
 // TODO: Should T be reified?
 @Suppress("REIFIED_TYPE_PARAMETER_NO_INLINE")
-public fun <@PureReifiable reified T> arrayOfNulls(size: Int): Array<T?> = Array(size) { null }
+public fun <@PureReifiable reified T> arrayOfNulls(size: Int): Array<T?> = Array(size)
 
 /**
  * Returns an array containing the specified elements.

libraries/stdlib/wasm/internal/kotlin/wasm/internal/Runtime.kt

@@ -119,4 +119,4 @@ internal fun stringGetPoolSize(): Int =
 // This initializer is a special case in FieldInitializersLowering
 @Suppress("DEPRECATION")
 @EagerInitialization
-internal val stringPool: Array<String?> = arrayOfNulls(stringGetPoolSize())
+internal val stringPool: Array<String?> = Array(stringGetPoolSize())