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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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- added __builtin_trap()
- generate .size and .type directives
- use natural alignment for variables


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CPragmas (PPC/EABI only): add #pragma reserve_register


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Algorithmic efficiency: in cparser/, precompute sizeof and alignof of composites.
Code cleanup: introduced Cutil.composite_info_{def,decl}


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- wrong simplification of && and || in the Set case
- generated nicer code for && and || in the Eval case


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