[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 5d99060ea7541521c68b1eb8e968cf2a31635554..5f3ef2a79c818556fdea710418d991cee532e2e8 100644
--- a/test/mjsunit/strong/declaration-after-use.js
+++ b/test/mjsunit/strong/declaration-after-use.js
@@ -193,10 +193,6 @@ 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) {