[turbofan] We cannot unconditionally flatten cons strings in the JSGraph.

[turbofan] We cannot unconditionally flatten cons strings in the JSGraph.

It is not always safe to allocate new heap objects in the JSGraph. We
might have to revisit this later once we do the canonicalization for
HeapConstants.

R=jarin@chromium.org
BUG=chromium:545364
LOG=n

Committed: https://crrev.com/d168a1e844715623e8d38cf1225a6deb3afff558
Cr-Commit-Position: refs/heads/master@{#31421}

[Jarin, 2015-10-20 15:27:47]

lgtm. Although I would really like understand why it is bad to flatten.

[Benedikt Meurer, 2015-10-20 15:35:11]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-10-20 15:35:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1413373002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1413373002/1

[commit-bot: I haz the power, 2015-10-20 15:48:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-20 15:48:13]

Patchset 1 (id:??) landed as
https://crrev.com/d168a1e844715623e8d38cf1225a6deb3afff558
Cr-Commit-Position: refs/heads/master@{#31421}