New branch: pretty-ipa

[Jan Hubicka <jh at suse dot cz>]

Hi,
with LTO getting closer it is obvious that IPA infrastructure needs work and
also is getting more interesting ;)

I don't think it makes sense to do all the work on LTO branch that
contains a lot of temporary stuff, so I've created pretty-ipa branch
that unlike LTO branch is targetted to merge very early in next stage1
and hopefully will make LTO branch merge in late stage1 smoother.  So
pretty-ipa is place for cleanups, infrastructure improvements and new
passes that do make sense on mainline or do make LTO/WHOPR easier.

I plan to do there some of work that was already discussed, such as
making IPA pass of nothrow/noreturn flags, rewriting inliner heuristics
to be more sane and scale better for large units, adding infrastructure
for clonning so IPA-CP can be WHOPReized. Everyone is welcome to send
patches too ;) Martin is working on function call regularization, Tomas
on dead argument removal.

I would like to merge the branch by splitting it to independent patches
as usually instead of merging it all at once so I would preffer if the
changes was resonably self contained, but it depends on the individual
cases.

Honza