fix temps that have the same name to have different Elements

test/codegen/expect/try_catch.js

Index: test/codegen/expect/try_catch.js
diff --git a/test/codegen/expect/try_catch.js b/test/codegen/expect/try_catch.js
index 8bdd4634016b15009cb92cd01388e6a80dabfeea..199e26cbb95378d446608d069a40c52043273817 100644
--- a/test/codegen/expect/try_catch.js
+++ b/test/codegen/expect/try_catch.js
@@ -53,10 +53,10 @@ var core = dart.import(core);
   function wub() {
     try {
       throw "on without exception parameter";
-    } catch (e$) {
-      if (dart.is(e$, core.String)) {
+    } catch (e) {
+      if (dart.is(e, core.String)) {
       } else
-        throw e$;
+        throw e;
     }
 
   }