[K/N] Unmute passing tests.

compiler/testData/codegen/box/specialBuiltins/irrelevantRemoveAtOverride.kt

@@ -1,5 +1,3 @@
-// IGNORE_BACKEND: NATIVE
-
 interface Container {
     fun removeAt(x: Int): String
 }

compiler/testData/codegen/box/specialBuiltins/maps.kt

@@ -1,5 +1,3 @@
-// IGNORE_BACKEND: NATIVE
-
 class A : Map<String, String> {
     override val size: Int get() = 56
 

compiler/testData/codegen/box/specialBuiltins/noSpecialBridgeInSuperClass.kt

@@ -1,5 +1,3 @@
-// IGNORE_BACKEND: NATIVE
-
 var result = ""
 
 public abstract class AbstractFoo<K, V> : Map<K, V> {

compiler/testData/codegen/box/specialBuiltins/removeAtTwoSpecialBridges.kt

@@ -1,5 +1,3 @@
-// IGNORE_BACKEND: NATIVE
-
 open class A0<E> : MutableList<E> {
     override fun add(element: E): Boolean {
         throw UnsupportedOperationException()