backend/tests: Add blackbox tests from Kotlin JVM

Added tests from testData/codegen/box directory. There are blackbox tests
in other directories and they are to be added.

backend.native/tests/external/codegen/blackbox/javaInterop/notNullAssertions/extensionReceiverParameter.kt

@@ -0,0 +1,32 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+// FILE: Test.java
+
+public class Test {
+    public static String invokeFoo() {
+        try {
+            ExtensionKt.foo(null);
+        }
+        catch (IllegalArgumentException e) {
+            try {
+                ExtensionKt.getBar(null);
+            }
+            catch (IllegalArgumentException f) {
+                return "OK";
+            }
+        }
+
+        return "Fail: assertion must have been fired";
+    }
+}
+
+// FILE: extension.kt
+
+fun Any.foo() { }
+
+val Any.bar: String get() = ""
+
+fun box(): String {
+    return Test.invokeFoo()
+}

backend.native/tests/external/codegen/blackbox/javaInterop/notNullAssertions/mapPut.kt

@@ -0,0 +1,10 @@
+
+fun <K: Any, V: Any> foo(k: K, v: V) {
+    val map = HashMap<K, V>()
+    val old = map.put(k, v)
+}
+
+fun box(): String {
+    foo("", "")
+    return "OK"
+}