Fix glibc -O2 iso646.i abort.
* config/ia64/ia64.c (rws_access_reg): New local write_count. If is_predicate_reg, then take max write_count of register pair. From-SVN: r34915
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* config/ia64/ia64.c (rws_access_reg): New local write_count. If is_predicate_reg, then take max write_count of register pair. From-SVN: r34915