PR#5933 type-specialize 'let compare = compare' on ints and strings
    
    According to the reporter 'sliquister', type-specialized comparison
    can nearly halve compilation time in some cases. This patch applies
    type-specialization throughout the OCaml distribution sources, so not
    all changes will have performance utility, but in this case I think
    it's best to be consistent, as I see no downside to the change.
    
    
    git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13410 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02