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

compiler/testData/diagnostics/tests/thisAndSuper/thisInInnerClasses.fir.kt

@@ -0,0 +1,11 @@
+// !CHECK_TYPE
+
+class A(val a:Int) {
+
+  inner class B() {
+    val x = checkSubtype<B>(this@B)
+    val y = checkSubtype<A>(this@A)
+    val z = checkSubtype<B>(this)
+    val Int.xx : Int get() = checkSubtype<Int>(this)
+  }
+}