Add new tests

compiler/testData/codegen/box/jvm8/defaults/allCompatibility/simpleFunction.kt

@@ -0,0 +1,33 @@
+// !JVM_DEFAULT_MODE: all-compatibility
+// IGNORE_BACKEND_FIR: JVM_IR
+// TARGET_BACKEND: JVM
+// FILE: Simple.java
+
+public interface Simple extends KInterface {
+    default String test() {
+        return KInterface.DefaultImpls.test2(this);
+    }
+}
+
+// FILE: Foo.java
+public class Foo implements Simple {
+
+}
+
+// FILE: main.kt
+// JVM_TARGET: 1.8
+// WITH_RUNTIME
+
+interface KInterface  {
+    fun test2(): String {
+        return "OK"
+    }
+}
+
+
+fun box(): String {
+    val result = Foo().test()
+    if (result != "OK") return "fail 1: ${result}"
+
+    return Foo().test2()
+}