- keep ALL mode_M nodes that have only unreachable users:   This fixes the problem than memory ops disappear before endless loops (fehler154.c) - fixed some typos
- keep ALL mode_M nodes that have only unreachable users:
  This fixes the problem than memory ops disappear before endless loops (fehler154.c)
- fixed some typos

[r23550]

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