KT-10483 Missing smart cast on variable in variable as function call

#KT-10483 Fixed

compiler/testData/diagnostics/tests/smartCasts/kt10483.kt

@@ -0,0 +1,17 @@
+interface A
+class B : A {
+    operator fun invoke() = this
+}
+
+class C : A
+
+operator fun C.invoke(): B = B()
+
+fun foo(arg: A): B? {
+    if (arg is B) return <!DEBUG_INFO_SMARTCAST!>arg<!>()
+
+    if (arg is C) return <!DEBUG_INFO_SMARTCAST!>arg<!>()
+
+    return null
+}
+