[C++ patch] accept __null as sentinel

[Mark Mitchell]

Michael Matz wrote:
> Like so.  (this now also introduces a -Wstrict-null-sentinel option, to be 
> put whereever it could fit).  I've tested this by building compiler, docu 
> and testcase only.  Bootstrap and regtest for C and C++ in progress (as 
> the code didn't really change I don't expect surprises, though).

This is OK, except that documentation should have appropriate texinfo 
markup for NULL and __null.  Preapproved with that change.

Thanks,

-- 
Mark Mitchell
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