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

compiler/testData/diagnostics/tests/callableReference/function/nestedConstructorFromTopLevel.fir.kt

@@ -0,0 +1,13 @@
+// !CHECK_TYPE
+
+import kotlin.reflect.KFunction0
+
+class A {
+    class Nested
+}
+
+fun main() {
+    val x = A::Nested
+
+    <!INAPPLICABLE_CANDIDATE!>checkSubtype<!><KFunction0<A.Nested>>(x)
+}