Bump virtual register width in LUnallocated.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/14589008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14516 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Implementation of Uint8ClampedArray.

R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/14657003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14517 ce2b1a6d-e550-0410-aec6-3dcde31c8c00