Improve parsing errors related to related to destructuring bind

Improve parsing errors related to destructuring bind

For destructuring bind, the parser needs to complain about things
which are inappropriate to have on the left-hand side.

Previously, regexp literals and template literals were let through
the parser inappropriately. This patch turns those into errors.

This patch also fixes off-by-one errors in reporting the location
of this type of error for strings and numbers. Before the patch,
the error would look like:

d8> var {x: 3} = {x: 4}
(d8):1: SyntaxError: Unexpected number
var {x: 3} = {x: 4}
      ^
SyntaxError: Unexpected number

And with the patch, the error is

d8> var {x: 3} = {x: 4}
(d8):1: SyntaxError: Unexpected number
var {x: 3} = {x: 4}
        ^
SyntaxError: Unexpected number

R=rossberg

Committed: https://crrev.com/9d6ab46aefdd2fac057e443ff5dd8ee81f570e39
Cr-Commit-Position: refs/heads/master@{#29661}

[Dan Ehrenberg, 2015-07-14 20:29:13]

littledan@chromium.org changed reviewers:
+ adamk@chromium.org

[adamk, 2015-07-14 21:06:22]

Code looks fine.

Your CL description says "left-hand side", where I think you mean "right-hand
side". Am I correct?

[Dan Ehrenberg, 2015-07-14 21:18:59]

On 2015/07/14 21:06:22, adamk wrote:
> Code looks fine.
> 
> Your CL description says "left-hand side", where I think you mean "right-hand
> side". Am I correct?

I think I mean left-hand side, as in, a pattern. It's on the right side of the :
but the left side of the =.

[adamk, 2015-07-14 21:21:36]

ah, makes sense, lgtm

[Dan Ehrenberg, 2015-07-14 21:25:56]

The CQ bit was checked by littledan@chromium.org

[commit-bot: I haz the power, 2015-07-14 21:26:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1236803003/1

[commit-bot: I haz the power, 2015-07-14 21:57:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-14 21:57:59]

Patchset 1 (id:??) landed as
https://crrev.com/9d6ab46aefdd2fac057e443ff5dd8ee81f570e39
Cr-Commit-Position: refs/heads/master@{#29661}