[strong] Adding regression cases which should always continue working.

[strong] Adding regression cases which should always continue working.

1) Mutually recursive functions
2) Strong code using non-strong var before declaration.

These test cases ensure that we don't accidentally kill these wanted behaviors
when adding restrictions to strong mode.

BUG=

Committed: https://crrev.com/868470ddc9b9b731a2315adcbdfd03b7bdcc3de2
Cr-Commit-Position: refs/heads/master@{#26671}

[marja, 2015-02-16 17:31:00]

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

[marja, 2015-02-16 17:31:01]

rossberg, ptal

[rossberg, 2015-02-16 17:32:36]

lgtm

[marja, 2015-02-16 17:35:28]

The CQ bit was checked by marja@chromium.org

[commit-bot: I haz the power, 2015-02-16 17:35:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/927143002/1

[commit-bot: I haz the power, 2015-02-16 17:57:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-16 17:57:50]

Patchset 1 (id:??) landed as
https://crrev.com/868470ddc9b9b731a2315adcbdfd03b7bdcc3de2
Cr-Commit-Position: refs/heads/master@{#26671}