toplev.c (rest_of_compilation): Call purge_hard_subreg_sets to remove all SETs of SUBREGs of hard registers.

2000-09-15  Andrew Haley  <aph@redhat.com>

        * toplev.c (rest_of_compilation): Call purge_hard_subreg_sets to
        remove all SETs of SUBREGs of hard registers.
        * function.c (purge_hard_subreg_sets): New function.
        (purge_single_hard_subreg_set): New function.
        * rtl.h: (purge_hard_subreg_sets): New function.

From-SVN: r36511