LHS of qualified expressions are determined manually

ExpressionPosition is useless now and will be dropped

 #KT-3866 Fixed

compiler/testData/diagnostics/tests/classObjects/kt3866.kt

@@ -0,0 +1,21 @@
+open class C {
+}
+
+fun C.foo() {}
+
+open class X {
+    class object : C() {}
+}
+
+open class Y {
+    class object : C() {}
+}
+
+fun bar() {
+    val x = X
+    x.foo()
+    X.foo()
+    (X : C).foo()
+    (X <!USELESS_CAST_STATIC_ASSERT_IS_FINE!>as<!> C).foo()
+    ((if (1<2) X else Y) : C).foo()
+}