[Test] Migrate AbstractBlackBoxCodegenTest to new infrastructure

compiler/test-infrastructure-utils/tests/org/jetbrains/kotlin/test/KtAssert.kt

@@ -29,6 +29,17 @@ object KtAssert {
         }
     }
 
+    @JvmStatic
+    @OptIn(ExperimentalContracts::class)
+    fun assertNull(message: String, value: Any?) {
+        contract {
+            returns() implies (value == null)
+        }
+        if (value != null) {
+            fail(message)
+        }
+    }
+
     @JvmStatic
     fun assertTrue(message: String, value: Boolean) {
         if (!value) {

compiler/test-infrastructure-utils/tests/org/jetbrains/kotlin/test/TargetBackend.kt

@@ -19,7 +19,8 @@ enum class TargetBackend(
     JS_IR(true, JS),
     JS_IR_ES6(true, JS_IR),
     WASM(true),
-    ANDROID(false, JVM);
+    ANDROID(false, JVM),
+    NATIVE(true);
 
     val compatibleWith get() = compatibleWithTargetBackend ?: ANY
 }