* cprop.c (struct reg_use): Remove.
	(reg_use_table): Make an array of RTX.
	(find_used_regs, constprop_register, local_cprop_pass,
	bypass_block): Simplify users of reg_use_table.
	(cprop_insn): Likewise.  Iterate if copy propagation succeeded
	on one of the uses found by find_used_regs.

From-SVN: r171999