Fix bootstrap failure on sparc/HPPA

[Andreas Tobler]

>Hi,
>the scenario what happends is that jump threading threads jump of basic block
>that sets register X, since it probles X is set to proper value previously in
>this path via libcse.  The destination of edge uses register X making
register
>X magically live in original block where it used to be killed by the threaded
>block.
>
>Fixed by deleting the notes, bootstrapped/regtested on i386 and I am going
>to install it as obivous.

The compiler bootstraped successfully under solaris2.6, building now the
multilibs.

Thanks,

Andreas