Reintroduced a fix for an alignment issue on ARM. I had reverted it by mistake. This fixes the serialization test suite on ARM.
Review URL: http://codereview.chromium.org/18751

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1152 ce2b1a6d-e550-0410-aec6-3dcde31c8c00