Ported the handle array construction in native code to x64. See http://codereview.chromium.org/193125 for details.

Please take a closer look of my use of the macro assembler Smi abstractions.
Review URL: http://codereview.chromium.org/209048

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2960 ce2b1a6d-e550-0410-aec6-3dcde31c8c00