[ira] patch for fixing most regressions on ppc and itanium

[Vladimir Makarov]

The following patch fixes most IRA regressions on gcc testsuite for
PPC and Itanium.  There are some minor changes in coloring too.

Vlad

2008-03-18  Vladimir Makarov  <vmakarov@redhat.com>

	* common.opt (fira-algorithm): Fix description

	* ira-int.h (allocno): Remove best_class.
	(ALLOCNO_BEST_CLASS): Remove.
	(strict_class_subset_p): Remove.
	
	* ira-color.c (get_coalesced_allocnos_best_class_and_freq): Rename
	to get_coalesced_allocnos_attributes.  Change prototype.
	Calculate available regs.
	(bucket_allocno_compare_func, sort_bucket): New functions.
	(sorted_allocnos_for_spilling): New variable.
	(assign_hard_reg): Don't add prohibited_class_mode_regs to
	conflicting_regs.  Use it in loop for finding the best hard
	register.
	(add_allocno_to_ordered_bucket): Use bucket_allocno_compare_func.
	(push_only_colorable): Call sort_bucket.
	(push_allocnos_to_stack): Use sorted_allocnos_for_spilling instead
	of sorted_allocnos.
	(put_allocno_into_bucket): Use add_allocno_to_bucket instead of
	add_allocno_to_ordered_bucket.
	(initiate_ira_assign): Allocate sorted_allocnos_for_spilling.
	(finish_ira_assign): Free sorted_allocnos_for_spilling.

	* ira-emit.c (modify_move_list): Remove setting ALLOCNO_BEST_CLASS
	up.
	
	* ira-build.c (create_allocno, create_cap_allocno): Ditto.
	
	* ira.c (strict_class_subset_p): Remove.
	(setup_class_subset_and_memory_move_costs): Remove setting
	strict_class_subset_p up.
	
	* ira-costs.c (setup_allocno_cover_class_and_costs): Remove
	setting ALLOCNO_BEST_CLASS up.
	

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