2017-04-10  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/70478
	* lra-constraints.c (curr_small_class_check): New.
	(update_and_check_small_class_inputs): New.
	(process_alt_operands): Update curr_small_class_check.  Disfavor
	alternative insn memory operands.  Check available regs for small
	class operands.

From-SVN: r246808