[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/inner/nestedClassExtendsOuter.fir.kt

@@ -0,0 +1,8 @@
+open class Outer {
+    class Nested : Outer() {
+        fun bar() = foo()
+        fun baz() = super.foo()
+    }
+    
+    fun foo() = 42
+}