Mute some box tests for native backend

This patch mutes the following test categories:
   * Tests with java dependencies (System class,
     java stdlib, jvm-oriented annotations etc).
   * Coroutines tests.
   * Reflection tests.
   * Tests with an inheritance from the standard
     collections.

compiler/testData/codegen/box/classes/classObjectToString.kt

@@ -1,5 +1,5 @@
 // TODO: Enable for JS when it supports Java class library.
-// IGNORE_BACKEND: JS
+// IGNORE_BACKEND: JS, NATIVE
 class SomeClass { companion object }
 
 fun box() = 

compiler/testData/codegen/box/classes/delegationJava.kt

@@ -1,5 +1,5 @@
 // Enable for JS when it supports Java class library.
-// IGNORE_BACKEND: JS
+// IGNORE_BACKEND: JS, NATIVE
 
 class TestJava(r : Runnable) : Runnable by r {}
 class TestRunnable() : Runnable {

compiler/testData/codegen/box/classes/kt1120.kt

@@ -1,6 +1,6 @@
 // Won't ever work with JS backend.
 // TODO: Consider rewriting this test without using threads, since the issue is not about threads at all.
-// IGNORE_BACKEND: JS
+// IGNORE_BACKEND: JS, NATIVE
 
 object RefreshQueue {
     val any = Any()

compiler/testData/codegen/box/classes/kt1134.kt

@@ -1,5 +1,5 @@
 // TODO: Enable when JS backend supports Java class library
-// IGNORE_BACKEND: JS
+// IGNORE_BACKEND: JS, NATIVE
 public class SomeClass() : java.lang.Object() {
 }
 

compiler/testData/codegen/box/classes/kt1157.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND: NATIVE
 public object SomeClass {
     private val work = object : Runnable {
         override fun run() {

compiler/testData/codegen/box/classes/kt2288.kt

@@ -1,5 +1,5 @@
 // TODO: Enable when JS backend supports Java class library
-// IGNORE_BACKEND: JS
+// IGNORE_BACKEND: JS, NATIVE
 public open class Test(): java.util.RandomAccess, Cloneable, java.io.Serializable
 {
         public override fun clone(): Test = Test() // Override 'clone()' with more precise type 'Test'

compiler/testData/codegen/box/classes/kt707.kt

@@ -1,5 +1,5 @@
 // TODO: Enable for JS when it supports Java class library.
-// IGNORE_BACKEND: JS
+// IGNORE_BACKEND: JS, NATIVE
 class List<T>(val head: T, val tail: List<T>? = null)
 
 fun <T> List<T>.mapHead(f: (T)-> T): List<T> = List<T>(f(head), null)

compiler/testData/codegen/box/classes/privateOuterFunctions.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND: NATIVE
 class C {
     private fun String.ext() : String = ""
     private fun f() {}

compiler/testData/codegen/box/classes/privateOuterProperty.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND: NATIVE
 class C{
     private var v : Int = 0