2015-05-14  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/65862
	* target.def (ira_change_pseudo_allocno_class): New hook.
	* targhooks.c (default_ira_change_pseudo_allocno_class): Default
	value of the hook.
	* targhooks.h (default_ira_change_pseudo_allocno_class): New
	extern
	* doc/tm.texi.in (TARGET_IRA_CHANGE_PSEUDO_ALLOCNO_CLASS): Add the
	hook.
	* ira-costs.c (find_costs_and_classes): Call the hook and change
	classes when it is necessary.
	* doc/tm.texi: Update.

From-SVN: r223202