2013-05-30  Vladimir Makarov  <vmakarov@redhat.com>

	* target.def (register_usage_leveling_p): New hook.
	* targhooks.c (default_register_usage_leveling_p): New.
	* targhooks.h (default_register_usage_leveling_p): New prototype.
	* lra-assigns.c (register_usage_leveling_p): Use the hook.
	* doc/tm.texi.in (TARGET_REGISTER_USAGE_LEVELING_P): New hook.
	* doc/tm.texi: Update.
	* config/i386/i386.c (TARGET_REGISTER_USAGE_LEVELING_P): Define.

From-SVN: r199459