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Refactoring of Constprop and Constpropproof into a machine-dependent part and a machine-independent part.



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Refactored Selection.v and Selectionproof.v into a machine-dependent part + a machine-independent part.


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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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Distribution of CIL as an expanded source tree with changes applied
(instead of original .tar.gz + patches to be applied at config time).


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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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