[K/N] Test for freezing disabling

kotlin-native/backend.native/tests/build.gradle

@@ -1216,6 +1216,15 @@ standaloneTest("freeze6") {
     testLogger = KonanTest.Logger.SILENT
 }
 
+standaloneTest("freeze_disabled") {
+    enabled = (project.testTarget != 'wasm32') && // No exceptions on WASM.
+            !isNoopGC && isExperimentalMM
+    flags = ["-tr"]
+    source = "runtime/workers/freeze_disabled.kt"
+    testLogger = KonanTest.Logger.SILENT
+}
+
+
 task atomic0(type: KonanLocalTest) {
     enabled = (project.testTarget != 'wasm32') // Workers need pthreads.
     useGoldenData = true

kotlin-native/backend.native/tests/runtime/workers/freeze_disabled.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package runtime.workers.freeze_disabled
+
+import kotlin.test.*
+import kotlin.native.concurrent.*
+
+// this test is ran with disabled freezing, so no mutability checks are done
+
+class A(var x:Int)
+
+@Test
+fun testClassNotFrozen(){
+    val a = A(1)
+    a.freeze()
+    a.x = 2
+    assertEquals(a.x, 2)
+}
+
+@Test
+fun testArrayNotFrozen(){
+    val a = arrayOf(1, 2, 3, 4, 5)
+    a.freeze()
+    a[0] = 6
+    assertEquals(a[0], 6)
+}