Version 3.27.34.3 (merged r22037)

Keep CodeRange::current_allocation_block_index_ in range after r21869.

BUG=305878,388328
LOG=N
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/332983006

git-svn-id: https://v8.googlecode.com/svn/branches/3.27@22075 ce2b1a6d-e550-0410-aec6-3dcde31c8c00