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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Include targets of preference edges in all_interf_regs.  Not needed for correctness, but this way temporaries that have preferences but no interferences do not fall in the default case of Coloring.alloc_of_coloring.  This used to create uncoalesced moves esp. on Arm.


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