Refactored tests using Array constructor:

Some moved to tests with stdlib
Some changed to use arrayOfNulls

compiler/testData/diagnostics/tests/labels/kt1703.kt

@@ -1,3 +1,6 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+public inline fun <reified T> Array(n: Int, block: (Int) -> T): Array<T> = null!!
+
 //KT-1703 Reference to label is unresolved
 
 fun test() {

compiler/testData/diagnostics/tests/labels/kt1703.txt

@@ -1,5 +1,6 @@
 package
 
+kotlin.inline() public fun </*0*/ reified T> Array(/*0*/ n: kotlin.Int, /*1*/ block: (kotlin.Int) -> T): kotlin.Array<T>
 internal fun test(): kotlin.Unit
 internal fun use(/*0*/ a: kotlin.Any?): kotlin.Any?
 internal fun </*0*/ T> kotlin.Array<out T>.forEach(/*0*/ operation: (T) -> kotlin.Unit): kotlin.Unit