[strong] Simplify the classes-referring-to-classes check.

[strong] Simplify the classes-referring-to-classes check.

Follow up for r28032.

We don't need to store the "corresponding outer scope class variables", it's
enough if we transmit the declaration group start to the inner class
variable.

R=rossberg@chromium.org
BUG=v8:3956
LOG=N

Committed: https://crrev.com/21557b4899255540b1bd81a732521607f1c22162
Cr-Commit-Position: refs/heads/master@{#28048}

[marja, 2015-04-24 12:40:00]

rossberg, here's another potential simplification, wdyt?

(This way, we wouldn't need to store the "corresponding outer class var" into
the ScopeInfo (idk even how to exactly), but it would be enough to store only
the declaration group...

[rossberg, 2015-04-24 13:02:59]

Great idea, LGTM!

[marja, 2015-04-24 13:03:23]

The CQ bit was checked by marja@chromium.org

[commit-bot: I haz the power, 2015-04-24 13:03:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1102903002/20001

[commit-bot: I haz the power, 2015-04-24 13:05:22]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-04-24 13:05:30]

Patchset 2 (id:??) landed as
https://crrev.com/21557b4899255540b1bd81a732521607f1c22162
Cr-Commit-Position: refs/heads/master@{#28048}