Merged r20262 into 3.23 branch.

Always initialize elements pointer in fast literals.

R=jochen@chromium.org
BUG=355586

Review URL: https://codereview.chromium.org/219213002

git-svn-id: https://v8.googlecode.com/svn/branches/3.23@20345 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/3.23' into 3.23