Version 3.30.9.1 (merged r24603)

Correctly expand literal buffer for surrogate pairs.

BUG=chromium:423212
LOG=N
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/655563004

git-svn-id: https://v8.googlecode.com/svn/trunk@24605 ce2b1a6d-e550-0410-aec6-3dcde31c8c00