[K/N] Throw exception on abstract class instantiation in ObjC

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

@@ -5450,6 +5450,14 @@ if (isAppleTarget(project)) {
         swiftSources = ['framework/stacktraceByLibbacktrace/']
     }
 
+    frameworkTest("testAbstractInstantiationFramework") {
+        framework('AbstractInstantiation') {
+            sources = ['framework/abstractInstantiation']
+        }
+        swiftSources = ['framework/abstractInstantiation/']
+        expectedExitStatus = 134
+    }
+
     frameworkTest("testFrameworkBundleId") {
         def currentTarget = project.target.name
         enabled = currentTarget.startsWith("mac")

kotlin-native/backend.native/tests/framework/abstractInstantiation/abstractInstantiation.kt

@@ -0,0 +1,8 @@
+/*
+ * Copyright 2010-2021 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.
+ */
+
+public abstract class AbstractBase(val y: Int) {
+    abstract val x: Int
+}

kotlin-native/backend.native/tests/framework/abstractInstantiation/abstractInstantiation.swift

@@ -0,0 +1,18 @@
+import Foundation
+import AbstractInstantiation
+
+func testInstantiate() throws {
+    // this is failure test, it shouldn't work
+    let base = AbstractBase(y: 5)
+}
+
+class AbstractInstantiationTests : TestProvider {
+    var tests: [TestCase] = []
+
+    init() {
+        providers.append(self)
+        tests = [
+            TestCase(name: "testInstantiate", method: withAutorelease(testInstantiate))
+        ]
+    }
+}

kotlin-native/backend.native/tests/objcexport/sealedClass.swift

@@ -2,7 +2,6 @@ import Kt
 
 private func test1() throws {
     let user = Person.User(id: 1)
-    let worker = Person.Worker()
     let employee = Person.WorkerEmployee(id: 2)
     let contractor = Person.WorkerContractor(id: 3)
     let userAsPerson: Person = user