Pass data flow info from '::' expressions, fix expected type

compiler/testData/diagnostics/tests/callableReference/bound/dataFlow.kt

@@ -0,0 +1,13 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+import kotlin.reflect.KClass
+
+fun f1(x: String?): String {
+    x!!::hashCode
+    return <!DEBUG_INFO_SMARTCAST!>x<!>
+}
+
+fun f2(y: String?): String {
+    val f: KClass<*> = (y ?: return "")::class
+    return <!DEBUG_INFO_SMARTCAST!>y<!>
+}