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

compiler/testData/diagnostics/tests/enum/enumModifier.fir.kt

@@ -0,0 +1,15 @@
+enum class B {}
+
+class A {
+   enum companion object {}
+}
+
+enum object O {}
+
+enum interface T {}
+
+enum fun f() = 0
+
+enum val x = 0
+
+enum var y = 0