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Function types didn't always degrade to pointers like they should.  Introduced and used Csyntax.typeconv to address this issue and reduce the number of cases in the classify functions

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Introduced Int.iwordsize and used it in place of "Int.repr 32" or
"Int.repr (Z_of_nat wordsize)".



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  #pragma use_section.
Some clean-ups in Cil2Csyntax.
Separate mach-dep parts of extraction/extraction.v into
   <arch>/extractionMachdep.v


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all x used as destination of a call [x = f(args)].  This wasn't true before
if x was a global C#minor variable.


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Kildall: simplified the interface
Constprop, CSE, Allocation, Linearize: updated for the new Kildall
RTL, LTL: removed the well-formedness condition on the CFG, 
  it is no longer necessary with the new Kildall and it is problematic
  for validated optimizations.
Maps: more efficient implementation of PTree.fold.


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and reactive divergence.  As a consequence:
- Removed the Enilinf constructor from traceinf (values of traceinf
  type are always infinite traces).
- Traces are now uniquely defined.
- Adapted proofs big step -> small step for Clight and Cminor accordingly.
- Strengthened results in driver/Complements accordingly.
- Added common/Determinism to collect generic results about
  deterministic semantics.


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Put "const" globals in read-only section.
Revised printing of rlwinm instruction.


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Conflict between extraction/CList and cil/obj/xxx/clist on case-insensitive file systems.  Replaced CList by CoqList and likewise for CString and CInt.  Removed useless references to CList in hand-written Caml code.

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- In Cminor and below, removed pointer validity check in semantics of 
  comparisons, so that evaluation of expressions is independent of
  memory state.
- In Cminor and below, removed "alloc" instruction.
- Cleaned up commented-away parts.


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Started to merge the ARM code generator.
Started to add support for PowerPC/EABI.
Use ocamlbuild to construct executable from Caml files.


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lib/Integers.v: added more properties for ARM port.
lib/Coqlib.v: added more properties for division and powers of 2.


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caml/PrintCsyntax.ml: afficher les formes a[b] et a->fld.



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- semantiques a continuation pour Cminor et CminorSel
- goto dans Cminor

Suppression de backend/RTLbigstep.v, devenu inutile.


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Revu les comparaisons de pointeurs: == et <> sont definis entre 2 pointeurs vers des blocs differents!

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Introduction de l'operation intuoffloat (float -> unsigned int).  Pas encore utilisee dans le front-end C.

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Fusion de la branche restr-cminor.  En Clight, C#minor et Cminor, les expressions sont maintenant pures et les appels de fonctions sont des statements.  Ajout de semantiques coinductives pour la divergence en Clight, C#minor, Cminor.  Preuve de preservation semantique pour les programmes qui divergent.

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En particulier:
- Semantiques small-step depuis RTL jusqu'a PPC
- Cminor independant du processeur
- Ajout passes Selection et Reload
- Ajout des langages intermediaires CminorSel et LTLin correspondants
- Ajout des tailcalls depuis Cminor jusqu'a PPC


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Suppression de lib/Sets.v, utilisation de FSet a la place.  Generalisation de Lattice pour utiliser une notion d'egalite possiblement differente de =.  Adaptation de Kildall et de ses utilisateurs en consequence.

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