Add -with-frame-pointers to ./configure
    
    This option can be used to tell the native compiler that it should
    update frame pointers, so that debuggers and profiling tools 
    (especially Linux perf) can use them. For now, it is only supported
    by the Unix/amd64 port.
    
    
    
    git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13730 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02