[parsing] When failing due to variable redeclaration, point at the variable.
We used to point elsewhere, for instance the right-hand-side of an assignment. Small limitation: Since variable proxies only have a start position, not an end position, the best we can do is point at the first character. (We cannot rely on the scanner's last token position because Declare may be called long after the variable has been scanned.) R=adamk@chromium.org BUG=v8:5572 Review-Url: https://codereview.chromium.org/2447143005 Cr-Commit-Position: refs/heads/master@{#40613}
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