Reland of [parsing] Fix maybe-assigned for loop variables.

Reland of [parsing] Fix maybe-assigned for loop variables. (patchset #1 id:1 of https://codereview.chromium.org/2679263002/ )

Reason for revert:
False alarm, bot hiccup

Original issue's description:
> Revert of [parsing] Fix maybe-assigned for loop variables. (patchset #3 id:40001 of https://codereview.chromium.org/2673403003/ )
> 
> Reason for revert:
> Speculative revert because of https://codereview.chromium.org/2679163002/.
> 
> Original issue's description:
> > [parsing] Fix maybe-assigned for loop variables.
> > 
> > Due to hoisting, the value of a 'var'-declared variable may actually change even
> > if the code contains only the "initial" assignment, namely when that assignment
> > occurs inside a loop.  For example:
> > 
> >   let i = 10;
> >   do { var x = i } while (i--):
> > 
> > As a simple and very conservative approximation of this, we explicitly mark
> > as maybe-assigned any non-lexical variable whose "declaration" does not
> > syntactically occur in the function scope.  (In the example above, it
> > occurs in a block scope.)
> > 
> > BUG=v8:5636
> > 
> > Review-Url: https://codereview.chromium.org/2673403003
> > Cr-Commit-Position: refs/heads/master@{#42989}
> > Committed: https://chromium.googlesource.com/v8/v8/+/a33fcd663b28b8846e12b97c30d6e7d837767f86
> 
> TBR=marja@chromium.org,adamk@chromium.org,neis@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:5636
> 
> Review-Url: https://codereview.chromium.org/2679263002
> Cr-Commit-Position: refs/heads/master@{#43010}
> Committed: https://chromium.googlesource.com/v8/v8/+/f3ae5ccf57690d8c2d87c4fe1d10b103ad6a4ab3

TBR=marja@chromium.org,adamk@chromium.org,neis@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5636
Review-Url: https://codereview.chromium.org/2686663002
Cr-Commit-Position: refs/heads/master@{#43013}
Committed: https://chromium.googlesource.com/v8/v8/+/5f9c89af7019761f56a87f4e56a319c34b35ebff

[Michael Hablich, 2017-02-07 20:42:24]

The CQ bit was checked by hablich@chromium.org

[Michael Hablich, 2017-02-07 20:42:24]

Created Reland of [parsing] Fix maybe-assigned for loop variables.

[commit-bot: I haz the power, 2017-02-07 20:42:33]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-02-07 20:43:18]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1486500144100320, "parent_rev":
"96e4f6145b0734daa3f2a9a2dce7e51ebbaab3c5", "commit_rev":
"5f9c89af7019761f56a87f4e56a319c34b35ebff"}

[commit-bot: I haz the power, 2017-02-07 20:43:22]

Description was changed from

==========
Reland of [parsing] Fix maybe-assigned for loop variables. (patchset #1 id:1 of
https://codereview.chromium.org/2679263002/ )

Reason for revert:
False alarm, bot hiccup

Original issue's description:
> Revert of [parsing] Fix maybe-assigned for loop variables. (patchset #3
id:40001 of https://codereview.chromium.org/2673403003/ )
> 
> Reason for revert:
> Speculative revert because of https://codereview.chromium.org/2679163002/.
> 
> Original issue's description:
> > [parsing] Fix maybe-assigned for loop variables.
> > 
> > Due to hoisting, the value of a 'var'-declared variable may actually change
even
> > if the code contains only the "initial" assignment, namely when that
assignment
> > occurs inside a loop.  For example:
> > 
> >   let i = 10;
> >   do { var x = i } while (i--):
> > 
> > As a simple and very conservative approximation of this, we explicitly mark
> > as maybe-assigned any non-lexical variable whose "declaration" does not
> > syntactically occur in the function scope.  (In the example above, it
> > occurs in a block scope.)
> > 
> > BUG=v8:5636
> > 
> > Review-Url: https://codereview.chromium.org/2673403003
> > Cr-Commit-Position: refs/heads/master@{#42989}
> > Committed:
https://chromium.googlesource.com/v8/v8/+/a33fcd663b28b8846e12b97c30d6e7d8377...
> 
> TBR=marja@chromium.org,adamk@chromium.org,neis@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:5636
> 
> Review-Url: https://codereview.chromium.org/2679263002
> Cr-Commit-Position: refs/heads/master@{#43010}
> Committed:
https://chromium.googlesource.com/v8/v8/+/f3ae5ccf57690d8c2d87c4fe1d10b103ad6...

TBR=marja@chromium.org,adamk@chromium.org,neis@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5636
==========

to

==========
Reland of [parsing] Fix maybe-assigned for loop variables. (patchset #1 id:1 of
https://codereview.chromium.org/2679263002/ )

Reason for revert:
False alarm, bot hiccup

Original issue's description:
> Revert of [parsing] Fix maybe-assigned for loop variables. (patchset #3
id:40001 of https://codereview.chromium.org/2673403003/ )
> 
> Reason for revert:
> Speculative revert because of https://codereview.chromium.org/2679163002/.
> 
> Original issue's description:
> > [parsing] Fix maybe-assigned for loop variables.
> > 
> > Due to hoisting, the value of a 'var'-declared variable may actually change
even
> > if the code contains only the "initial" assignment, namely when that
assignment
> > occurs inside a loop.  For example:
> > 
> >   let i = 10;
> >   do { var x = i } while (i--):
> > 
> > As a simple and very conservative approximation of this, we explicitly mark
> > as maybe-assigned any non-lexical variable whose "declaration" does not
> > syntactically occur in the function scope.  (In the example above, it
> > occurs in a block scope.)
> > 
> > BUG=v8:5636
> > 
> > Review-Url: https://codereview.chromium.org/2673403003
> > Cr-Commit-Position: refs/heads/master@{#42989}
> > Committed:
https://chromium.googlesource.com/v8/v8/+/a33fcd663b28b8846e12b97c30d6e7d8377...
> 
> TBR=marja@chromium.org,adamk@chromium.org,neis@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:5636
> 
> Review-Url: https://codereview.chromium.org/2679263002
> Cr-Commit-Position: refs/heads/master@{#43010}
> Committed:
https://chromium.googlesource.com/v8/v8/+/f3ae5ccf57690d8c2d87c4fe1d10b103ad6...

TBR=marja@chromium.org,adamk@chromium.org,neis@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5636

Review-Url: https://codereview.chromium.org/2686663002
Cr-Commit-Position: refs/heads/master@{#43013}
Committed:
https://chromium.googlesource.com/v8/v8/+/5f9c89af7019761f56a87f4e56a319c34b3...
==========

[commit-bot: I haz the power, 2017-02-07 20:43:23]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/5f9c89af7019761f56a87f4e56a319c34b3...