[C++0x] nullptr

[Jason Merrill]

On 05/02/2010 07:17 PM, Magnus Fromreide wrote:
>>   or would you like me to make the necessary changes to the debugging backends?
>
> Yes, please.

I made those changes and a few other tweaks that I noticed while 
preparing the patch to go in:

* I think my choice of std::nullptr_t was wrong before, so I changed it 
to decltype(nullptr).
* I put typeid(decltype(nullptr)) into the runtime library.
* I added some tests for debugging, mangling and demangling.
* I fixed an instance of "nullptr" in the fortran front end.
* And a few other minor tweaks.

Attached are the diffs relative to your patches (nullptr-changes.patch) 
and the full patch I'm committing (nullptr-full.patch).

Thanks a lot for your work on this!

Tested x86_64-pc-linux-gnu, applying to trunk.  Now you only need to 
deal with the library folks. :)

Incidentally, library folks: does my change to gnu.ver look right?  I 
noticed that the stuff I put there before was redundant.
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