MaterializedLiteral expressions need to cache expression depth.

MaterializedLiteral expressions need to cache expression depth.

A problem arises in recursive literal expressions due to recent
changes that defer allocation of constant literal properties
from parse time. We were calculating expression depth as a
side-effect of a lazy constant property build, but subsequent
calls for the depth always returned 1. Cache the correct depth
in the MaterializedLiteral instead.

(Related-to/very-partial-revert-of
https://codereview.chromium.org/61873003)

R=ulan@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=17929

[mvstanton, 2013-11-20 13:56:50]

Hi Ulan,
Here is the change we discussed, thx!
--Michael

[ulan, 2013-11-20 14:00:02]

LGTM

[mvstanton, 2013-11-20 14:17:57]

Committed patchset #2 manually as r17929 (presubmit successful).

[Michael Starzinger, 2013-11-20 14:20:49]

Drive-by LGTM (since it's referring to one of my changes).