Hydrogen object literals: always initialize in-object properties

Hydrogen object literals: always initialize in-object properties

This fixes a bug where new-space GC could be triggered by non-folded allocations for some of the in-object properties, while the object was only partially initialized.

BUG=chromium:500497
LOG=y
R=ishell@chromium.org

Committed: https://crrev.com/5fca3947cf52f5ff2c5d094281a38347eb9df68f
Cr-Commit-Position: refs/heads/master@{#29079}

[Jakob Kummerow, 2015-06-16 15:37:29]

PTAL

[Igor Sheludko, 2015-06-17 10:44:37]

lgtm

[Jakob Kummerow, 2015-06-17 10:45:53]

The CQ bit was checked by jkummerow@chromium.org

[commit-bot: I haz the power, 2015-06-17 10:46:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1182113007/1

[commit-bot: I haz the power, 2015-06-17 11:24:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-17 11:24:33]

Patchset 1 (id:??) landed as
https://crrev.com/5fca3947cf52f5ff2c5d094281a38347eb9df68f
Cr-Commit-Position: refs/heads/master@{#29079}