Control-Flow Analysis: Reuse pseudo-value information for unused expression analysis

compiler/testData/diagnostics/tests/labels/kt361.kt

@@ -1,5 +1,5 @@
 fun nonlocals(b : Boolean) {
-    @a{(): Int ->
+    @a<!UNUSED_FUNCTION_LITERAL!>{(): Int ->
         fun foo() {
             if (b) {
                 <!RETURN_NOT_ALLOWED!>return@a 1<!> // The label must be resolved, but an error should be reported for a non-local return
@@ -7,6 +7,5 @@ fun nonlocals(b : Boolean) {
         }
 
         return@a 5
-    }
-}
-
+    }<!>
+}