[strong] Allow mutually recursive classes.

[strong] Allow mutually recursive classes.

The previous restrictions were overshooting (didn't allow a class to refer to a
later class under any circumstances); after this CL we're undershooting (allow
referring to any class from inside a method).

Implementing the correct checks (allow referring only if the class declarations
are in a consecutive block and if there's no dependency cycle) will be
implemented as a follow up.

BUG=v8:3956
LOG=N

Committed: https://crrev.com/2dc0f2ec01f521a3fea8d8e18dd99c87118b36df
Cr-Commit-Position: refs/heads/master@{#27888}

[marja, 2015-04-16 13:10:41]

marja@chromium.org changed reviewers:
+ rossberg@chromium.org

[marja, 2015-04-16 13:10:41]

... rossberg@, I was thinking about doing this in pieces since the changes might
get big. Wdyt?

The current situation is overly strict. This CL relaxes the restrictions and is
overly sloppy (doesn't detect some error cases), and I'd implement the actual
correct restrictions in a follow-up...

[rossberg, 2015-04-16 13:44:01]

lgtm

[marja, 2015-04-16 13:46:01]

The CQ bit was checked by marja@chromium.org

[commit-bot: I haz the power, 2015-04-16 13:46:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1087543004/40001

[commit-bot: I haz the power, 2015-04-16 14:13:08]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-04-16 14:13:14]

Patchset 3 (id:??) landed as
https://crrev.com/2dc0f2ec01f521a3fea8d8e18dd99c87118b36df
Cr-Commit-Position: refs/heads/master@{#27888}