gcc/
	* ira-int.h (target_ira_int): Add x_ira_useful_class_mode_regs.
	(ira_useful_class_mode_regs): New macro.
	* ira.c (clarify_prohibited_class_mode_regs): Set up
	ira_useful_class_mode_regs.
	* ira-color.c (setup_profitable_hard_regs): Use it to initialise
	profitable_hard_regs.

From-SVN: r191996