1) Fix confusion between for of and for in.

2) If a for loop doesn't declare its variables, no new variables
are introduced (the outer scope variables are used).

3) Add more cases for destructuring for and destructuring catch.

BUG=v8:5501, v8:5516

Review-Url: https://codereview.chromium.org/2614023004
Cr-Commit-Position: refs/heads/master@{#42125}