haifa-sched: Fix problems with cc0 in prune_ready_list

Bernd Schmidt bernds@codesourcery.com
Wed Feb 8 15:17:00 GMT 2012

We found a scheduler problem while testing Coldfire targets. The
prune_ready_list function I introduced doesn't take SCHED_GROUPs into
account, which can lead to a random insn being scheduled between a cc0
setter and user. The patch below fixes it, OK? (Bootstrapped & tested

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