Move callable reference diagnostic tests to non-stdlib

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

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