bug fix

do not combine receiverInfo with error selectorInfo

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

@@ -0,0 +1,13 @@
+package foo
+
+fun dispatch(request: Request) {
+    val <!UNUSED_VARIABLE!>url<!> = request.getRequestURI() as String
+
+    if (request.getMethod()?.length != 0) {
+    }
+}
+
+trait Request {
+    fun getRequestURI(): String?
+    fun getMethod(): String?
+}