What happened to the IRA interprocedural reg-alloc work? (function_used_regs and friends)

[Steven Bosscher]

Hi Vlad,

While browsing through old yara/ira patches, I came across this patch
of yours from several years ago:

http://gcc.gnu.org/ml/gcc-patches/2007-01/msg01625.html

That work was in your IRA presentation at the GCC summit in 2007, and
it was also part of the initial merge request for IRA. But it's not
currently in the trunk and it doesn't appear to ever have been there
(nothing in the ChangeLogs about removing/adding this).

What happened to the patch?

Ciao!
Steven