Parse eagerly inside block scopes.

Parse eagerly inside block scopes.

Only this way we can precisely determine how to allocate let variables
inside the scope.

R=rossberg@chromium.org
BUG=v8:4255
LOG=N

Committed: https://crrev.com/972beef14ce917512399d3652c9456f013779438
Cr-Commit-Position: refs/heads/master@{#29354}

[Yang, 2015-06-29 11:05:19]

The CQ bit was checked by yangguo@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-29 11:05:23]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1216013002/40001

[commit-bot: I haz the power, 2015-06-29 11:52:46]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-29 11:52:47]

Dry run: Try jobs failed on following builders:
  v8_linux_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_rel/builds/7082)

[Yang, 2015-06-29 13:46:23]

The CQ bit was checked by yangguo@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-29 13:46:33]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1216013002/100001

[commit-bot: I haz the power, 2015-06-29 14:13:45]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-29 14:13:46]

Dry run: This issue passed the CQ dry run.

[rossberg, 2015-06-29 15:55:39]

lgtm

[Yang, 2015-06-29 16:14:34]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2015-06-29 16:14:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1216013002/100001

[commit-bot: I haz the power, 2015-06-29 16:16:10]

Committed patchset #6 (id:100001)

[commit-bot: I haz the power, 2015-06-29 16:16:31]

Patchset 6 (id:??) landed as
https://crrev.com/972beef14ce917512399d3652c9456f013779438
Cr-Commit-Position: refs/heads/master@{#29354}