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Bugs with 1- empty bitfields, 2- anonymous bitfields, 3- result type of reading a small unsigned bitfield

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  as bitwise operations rather than arithmetic ones.
CastOptimproof: fixed for ARM port.
Other files: adapted to changes in Integers.


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- Csyntax, Csem: source C language has side-effects within expressions,
  performs implicit casts, and has nondeterministic reduction semantics
  for expressions
- Cstrategy: deterministic red. sem. for the above
- Clight: the previous source C language, with pure expressions.
  Added: temporary variables + implicit casts.
- New pass SimplExpr to pull side-effects out of expressions
  (previously done in untrusted Caml code in cparser/)
- Csharpminor: added temporary variables to match Clight.
- Cminorgen: adapted, removed cast optimization (moved to back-end)
- CastOptim: RTL-level optimization of casts
- cparser: transformations Bitfields, StructByValue and StructAssign
  now work on non-simplified expressions
- Added pretty-printers for several intermediate languages,
  and matching -dxxx command-line flags.



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AST: add ef_inline flag to external functions.
Selection: recognize calls to inlined built-ins and inline them as Sbuiltin.
CminorSel to Asm: added Sbuiltin/Ibuiltin instruction.
PrintAsm: adapted expansion of builtins.
C2Clight: adapted detection of builtins.
Conventions: refactored in a machine-independent part (backend/Conventions)
  and a machine-dependent part (ARCH/SYS/Conventions1).


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*/PrintAsm.ml: watch out for large stack frames in Pallocframe.


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- Revised handling of volatile reads: the execution environment
  dictates the value read, via the trace of events.


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wrong because of +0.0 / -0.0.  
Adapted Clight semantics accordingly.  (Truth value of a float is
defined by comparison Float.cmp Ceq with 0.0, no longer by structural
equality.)


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Minor updates on ARM code generator.


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Finished proof of chunktype_compat, which was incomplete.


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Attempt coalescing between stack-allocated variables.


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Those moves are not always coalesced during coloring.  The resulting
smaller RTL code also reduces the load on the rest of the back-end.
RTLgenspec.v: use spiffy saturateTrans tactic to speed up proof search.


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Clight and C#minor.  Recognize __builtin_fabs and turn it into this operator.


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