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

compiler/testData/diagnostics/tests/redeclarations/NoRedeclarationForClassesInDefaultObject.fir.kt

@@ -0,0 +1,12 @@
+package kt2247
+
+class B {
+    companion object {
+        class Y {
+        }
+    }
+
+    class Y {
+    }
+
+}