smaps_rollup

Hi Craig,

Attached are 6 patches for newlib, most of which deal with the addition 
of 'smaps_rollup' support to the library and top.

I've tried to make the implementation as efficient as possible.  Still, 
the costs for accessing this new file are tremendous as documented in 
some commit messages.

Such costs are of no concern to a one-shot program like ps and under 
normal circumstances probably not top either.  However, they would be 
recurring and are, at least, a bit of a surprise.

Anyway, with this new support, perhaps you should invite Craig Ringer 
(issue #201) to add what he deems important to the ps program.

Thanks in advance for the push.

Regards,

Jim

p.s. Don't ever do what I did in a couple of commit messages. For 
aesthetics I used the 'before' convention shown below for some smaps 
timings.

However, I discovered that git drops everything beginning with that line 
and continuing up to the actual diff when the patches are applied.  That 
included some references too.

In hindsight it's now obvious git keys on that leading '--- ' and 
assumed my stuff was part of his files change summary.

So, I resorted to the 'after' convention to circumvent the issue.

before:
--- as a regular user --------------------------------
after:
------------------------------------ as a regular user