Move callable reference diagnostic tests to non-stdlib

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

@@ -0,0 +1,19 @@
+// !CHECK_TYPE
+
+import kotlin.reflect.KFunction0
+
+class A {
+    fun main() {
+        val x = ::A
+
+        checkSubtype<KFunction0<A>>(x)
+    }
+}
+
+class SomeOtherClass {
+    fun main() {
+        val x = ::A
+
+        checkSubtype<KFunction0<A>>(x)
+    }
+}