Add ASan lazy sweep annotations to allow Persistent<> creation.

Add ASan lazy sweep annotations to allow Persistent<> creation.

Destructors are allowed to allocate, including the creation of
Persistent<>s and linking them into the root set.

That might end up touching other objects that are in the process of
being swept and are poisoned. Benign, add annotations.

R=haraken
BUG=491488
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=198081

[sof, 2015-06-30 15:14:06]

sigbjornf@opera.com changed reviewers:
+ oilpan-reviews@chromium.org

[sof, 2015-06-30 15:14:07]

Making this available, just in case.

i.e., https://chromiumcodereview.appspot.com/1213133002/ invalidates the need
for this one, but should it run into unforeseen issues and be delayed.

~ImageLoader ran into this, creating a Persistent<> via loadEventSender() in
some cases.

[haraken, 2015-06-30 15:15:29]

LGTM

[sof, 2015-06-30 18:33:01]

will land this now instead, as I'd like to enable lazy sweeping.

A rebase will unfortunately be needed for the slimmer Persistent<> CL; sorry
about the extra overhead.

[sof, 2015-06-30 18:33:11]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-06-30 18:33:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1215153002/1

[commit-bot: I haz the power, 2015-06-30 18:37:56]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=198081