Repost: RFA [4.1]: improvement to if-conversion and cross-jumping (PR20070)

[Joern RENNECKE]

Jan Hubicka wrote:

>  
>
>Could you try how it behaves pre-reload then?  (if you can send me
>patch, I can give it a SPEC run too) I saw pretty common case where code
>duplication prevented ifconvert, so it might be interesting to see how
>things are affected by this.
>  
>
I added some sanity checks and they trigger on i686-pc-linux-gnu.  It 
appears that
we don't have consistent register liveness information to start with.  
I've started
to add some more debug code (not in the ChangeLog), but I can't finish 
this today.

I have attached what I have so far.
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