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

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

@@ -0,0 +1,14 @@
+interface P<U, Y>
+
+class A<T> {
+    class B {
+        fun test() {
+            class C<W>() : P<W, T> {
+                companion object : P<W, T> {
+                }
+
+                inner class D : P<W, T>
+            }
+        }
+    }
+}