[ira] patch fixing a performance degradation for sh4

[Vladimir Makarov]

The following patch fixes a problem reported by Kaz Kojima in

http://gcc.gnu.org/ml/gcc-patches/2008-04/msg00467.html

2008-04-06  Vladimir Makarov  <vmakarov@redhat.com>

	* ira-int.h (reg_class_intersect, reg_class_union): Add comments.
	
	* hard-reg-set.h (reg_class_subclasses): New external definition.

	* ira.c (setup_reg_class_intersect_union): Define for classes
	containing no hard registers available for allocation.

	* regclass.c (reg_class_subclasses): Make it external.

	* config/sh/sh.h (IRA_COVER_CLASSES): Add TARGET_REGS.
	


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