loop.c (reg_single_usage): New file-scope variable ...

loop.c (reg_single_usage): New file-scope variable ...

        * loop.c (reg_single_usage): New file-scope variable ...
        (scan_loop): ... moved out of here.  Always initialize.
        Test loop_has_call instead of reg_single_usage not zero.
        Free reg_single_usage after strength reduction.
        (count_loop_regs_set): Assume single_usage non-zero.
        (combine_givs_used_by_other): Test reg_single_usage.
        (load_mems_and_recount_loop_regs_set): Remove reg_single_usage
        as a parameter.  Assume non-zero.

From-SVN: r25098