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

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

@@ -0,0 +1,12 @@
+// FILE: f.kt
+class A() {
+  fun foo() : Unit {
+    this@A
+    this@a
+    this
+  }
+
+  val x = this@A.foo()
+  val y = this.foo()
+  val z = foo()
+}