Correctly handlify CopyContextLocalsToScopeObject.

Handlified functions that expect allocation must be static, i.e. not allow to
use 'this', since 'this' is not relocated by potential GC.

R=ulan@chromium.org
BUG=

Review URL: https://codereview.chromium.org/25704002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17068 ce2b1a6d-e550-0410-aec6-3dcde31c8c00