7795806 Move ast_mapper to parsing/, make it part of compiler-libs, and add an interface. Plus minor code cleanup.

Authored and Committed by Alain Frisch 11 years ago
    Move ast_mapper to parsing/, make it part of compiler-libs, and add an interface.  Plus minor code cleanup.
    
    git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13249 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
    
        
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parsing/ast_mapper.ml tools/ast_mapper.ml
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