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

compiler/testData/diagnostics/tests/declarationChecks/illegalModifiersOnClass.fir.kt

@@ -0,0 +1,19 @@
+// !DIAGNOSTICS: -MANY_COMPANION_OBJECTS -REDECLARATION -DUPLICATE_CLASS_NAMES
+
+// KT-3464 Front-end shouldn't allow override modifier in class declaration
+
+override class A {
+    override companion object {}
+    open companion object {}
+    abstract companion object {}
+    final companion object {}
+}
+
+override object B1 {}
+open object B2 {}
+abstract object B3 {}
+final object B4 {}
+
+override enum class C {}
+override interface D {}
+override annotation class E