[turbofan] Move workaround with TDZ of 'this' variable.

[turbofan] Move workaround with TDZ of 'this' variable.

Note that this just narrows the existing workaround for any 'this' in
derived constructors (having a temporal dead zone) so that we can still
recognize static cases correctly (i.e. when 'this' is provably outside
or inside the temporal dead zone).

R=rossberg@chromium.org

Committed: https://crrev.com/d67e07f3971b3fe6ecff612b5b73e9191b0e32c4
Cr-Commit-Position: refs/heads/master@{#29762}

[Michael Starzinger, 2015-07-20 15:04:56]

Ugly workaround is being ugly (but optimized). :)

[rossberg, 2015-07-20 15:56:32]

lgtm

[Michael Starzinger, 2015-07-20 15:57:22]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-07-20 15:57:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1245653002/1

[commit-bot: I haz the power, 2015-07-20 16:02:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-20 16:02:22]

Patchset 1 (id:??) landed as
https://crrev.com/d67e07f3971b3fe6ecff612b5b73e9191b0e32c4
Cr-Commit-Position: refs/heads/master@{#29762}