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

compiler/testData/diagnostics/tests/modifiers/primaryConstructorMissingKeyword.fir.kt

@@ -0,0 +1,9 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+annotation class Ann(val x: Int = 1)
+class A private (val x: Int) {
+inner class B @Ann(2) (val y: Int)
+
+fun foo() {
+    class C private @Ann(3) (args: Int)
+    }
+}