[RFC] printf-hooks patch (nearing the final interface)

[Ryan Arnold]

Hi Ulrich, et al,

I updated and respun the printf-hooks patch once again and posted an
update to the bugzilla.

http://sourceware.org/bugzilla/show_bug.cgi?id=6846#c16

This is pretty close to what I think will be the final interface.  I'd
appreciate some comments:

http://sourceware.org/bugzilla/attachment.cgi?id=3787&action=view

There are a few things which could be improved, namely extending the
number of user size flags that are supported for length-modifiers.

Does anyone have an interest in seeing an override for 'flag characters'
supported?

Btw, as written this should work with Altivec/VMX, VSX, DFP, and AVX so
I'd appreciate it if interested parties could comment.

Ryan S. Arnold
IBM Linux Technology Center.