do not need to check stand-alone class object for class,

when it's on the left hand side of dot it is analyzed in 'getIdForImplicitReceiver' (test added)

compiler/testData/diagnostics/tests/smartCasts/classObjectMember.kt

@@ -0,0 +1,22 @@
+open class T {
+    val x : Int? = null
+}
+
+class A {
+    class object: T() {
+    }
+}
+
+class B {
+    class object: T() {
+    }
+}
+
+fun test() {
+    if (A.x != null) {
+        useInt(A.x)
+        useInt(<!TYPE_MISMATCH!>B.x<!>)
+    }
+}
+
+fun useInt(i: Int) = i