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

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

@@ -0,0 +1,12 @@
+interface My {
+    private val x: Int
+    private abstract val xx: Int
+    private val xxx: Int
+        get() = 0
+    final val y: Int
+    final val yy: Int
+        get() = 1
+    private fun foo(): Int
+    // ok
+    private fun bar() = 42
+}