regs.h (reg_n_max): Don't declare.
* regs.h (reg_n_max): Don't declare. * flow.c (reg_n_max): Don't define. * regclass.c (renumber): Don't initialize to zero. (regno_allocated): Likewise. (reg_n_max): Define. (allocate_reg_info): Don't initialize unnecessarily. From-SVN: r33374
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