* bitmap.h (bitmap_equal_p): Return bool.
	(bitmap_intersect_p, bitmap_intersect_compl_p): Declare.
	* bitmap.c (bitmap_equal_p): Return bool. Compare directly.
	(bitmap_intersect_p, bitmap_intersect_compl_p): New.
	* flow.c (calculate_global_regs_live): Use bitmap_intersect_p and
	bitmap_intersect_compl_p.
	* ifcvt (dead_or_predicable): Likewise.

From-SVN: r89981