This is in preparation for the addition of --harmony-destructuring-assignment.
BUG=v8:811
LOG=n
Review URL: https://codereview.chromium.org/1450193002
Cr-Commit-Position: refs/heads/master@{#32098}
When the checker was added prohibiting lexical binding called let,
certain error propagation was not implemented properly. This patch
fixes that issue, which fixes error checking for cases such as
let [let]
BUG=v8:4403
R=adamk
LOG=N
Review URL: https://codereview.chromium.org/1409613003
Cr-Commit-Position: refs/heads/master@{#31289}