[arch-dev-public] isl update and gcc-4.6 status

Hi, I just put an update for isl in [testing]. It had an soname bump, so cloog is rebuilt as is gcc-4.6. I'm guessing the multilib toolchain will need a rebuild too... While I was at it, I took a new cvs snapshot for gcc-4.6 as there are a few good bug fixes there. I will probably call for signoffs for the toolchain in a couple of days if no issues come to light in that time. Allan