Instead of passing a size in bytes to the allocation function, we now
have a templatized Alloc function:
zone->Alloc<Type>(len)
This is better for security, as we can check for integer overflow in
the size computation before performing the allocation. Before, we
often failed to check this.
Review URL: https://chromiumcodereview.appspot.com//10836061
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@10254 260f80e4-7a28-3924-810f-c04153c831b5
turnidge@google.com