bug#15880: Compute C declarations for DEFSYMs automatically.

[Paul Eggert]

On 01/05/2015 08:51 AM, Stefan Monnier wrote:
> For the USE_LSB_TAG case,
> that's not a problem, but for the case where we use the MSB for the tag,
> a negative number will not have the expected 000 in the MSB.

Thanks, good catch.  This is a problem on !USE_LSB_TAG platforms where 
heap memory lives below statically-allocated memory.  That should be 
rare (I don't know of such a platform offhand), but for now the simplest 
fix is to avoid this optimization on !USE_LSB_TAG platforms.  Revised 
patches attached, updated to match the latest master.

0001-Compute-C-decls-for-DEFSYMs-automatically.patch
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0002-Use-0-for-Qnil.patch
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