regclass.c (call_really_used_regs): Conditionally define.

regclass.c (call_really_used_regs): Conditionally define.

        * regclass.c (call_really_used_regs): Conditionally define.
        (init_reg_sets_1): Don't use it if not defined.
        (fix_register): Similarly, don't set it.

From-SVN: r44567