This unifies the stackframe layout of the generic constructor stub to be
in sync with ia32 and x64. There was an unecessary copy of the construct
function saved on the stack which wasn't used at all.

R=erik.corry@gmail.com

Review URL: https://chromiumcodereview.appspot.com/9348058

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10653 ce2b1a6d-e550-0410-aec6-3dcde31c8c00