used new set_irg_doms_inconsistent() to invalidate dom and postdom
used new set_irg_doms_inconsistent() to invalidate dom and postdom

[r7203]

jonashaag/libfirm,jonashaag/libfirm,jonashaag/libfirm,jonashaag/libfirm,8l/libfirm,killbug2004/libfirm,MatzeB/libfirm,davidgiven/libfirm,MatzeB/libfirm,davidgiven/libfirm,MatzeB/libfirm,MatzeB/libfirm,8l/libfirm,MatzeB/libfirm,jonashaag/libfirm,killbug2004/libfirm,jonashaag/libfirm,8l/libfirm,davidgiven/libfirm,MatzeB/libfirm,killbug2004/libfirm,8l/libfirm,8l/libfirm,davidgiven/libfirm,libfirm/libfirm,killbug2004/libfirm,jonashaag/libfirm,8l/libfirm,libfirm/libfirm,libfirm/libfirm,8l/libfirm,libfirm/libfirm,killbug2004/libfirm,MatzeB/libfirm,davidgiven/libfirm,davidgiven/libfirm,killbug2004/libfirm,libfirm/libfirm,davidgiven/libfirm,killbug2004/libfirm