Add prototypes for static functions.

Add prototypes for static functions.

(last_{jump,label}_suid): Deleted; all uses deleted.
(reg_crosses_blocks): Likewise.
(stupid_life_analysis): Only allocate MAX_SUID entries of after_insn_hard_regs.
Use GET_RTX_CLASS when possible.
Initialize all of reg_renumber.
Use reg_alternate_class when reg not available in preferred class.
(stupid_find_reg): Delete argument CROSSES_BLOCKS.

From-SVN: r6706