[es6] Ensure that for-in/of loops have a proper TDZ for their boundnames

test/mjsunit/strong/declaration-after-use.js

Index: test/mjsunit/strong/declaration-after-use.js
diff --git a/test/mjsunit/strong/declaration-after-use.js b/test/mjsunit/strong/declaration-after-use.js
index 05df8e835c9b4e9bc8f280374353f270983dac2f..af93bd811f5b7452987d4eea431d778b6834e5cf 100644
--- a/test/mjsunit/strong/declaration-after-use.js
+++ b/test/mjsunit/strong/declaration-after-use.js
@@ -192,10 +192,6 @@ function assertThrowsHelper(code) {
     i;
   }
 
-  let var6 = [1, 2];
-  // The second var6 resolves to outside (not to the first var6).
-  for (let var6 of var6) { var6; }
-
   try {
     throw "error";
   } catch (e) {