Clean up how we handle small data load/store operations.

gcc/
2018-01-18  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc-protos.h (prepare_extend_operands): Remove.
	(small_data_pattern): Likewise.
	(arc_rewrite_small_data): Likewise.
	* config/arc/arc.c (LEGITIMATE_SMALL_DATA_OFFSET_P): Remove.
	(LEGITIMATE_SMALL_DATA_ADDRESS_P): Likewise.
	(get_symbol_alignment): New function.
	(legitimate_small_data_address_p): Likewise.
	(legitimate_scaled_address): Update, call
	legitimate_small_data_address_p.
	(output_sdata): New static variable.
	(arc_print_operand): Update how we handle small data operands.
	(arc_print_operand_address): Likewise.
	(arc_legitimate_address_p): Update, use
	legitimate_small_data_address_p.
	(arc_rewrite_small_data_p): Remove.
	(arc_rewrite_small_data_1): Likewise.
	(arc_rewrite_small_data): Likewise.
	(small_data_pattern): Likewise.
	(compact_sda_memory_operand): Update to use
	legitimate_small_data_address_p and get_symbol_alignment.
	(prepare_move_operands): Don't rewite sdata pattern.
	(prepare_extend_operands): Remove.
	* config/arc/arc.md (zero_extendqihi2): Don't rewrite sdata
	pattern.
	(zero_extendqisi2): Likewise.
	(zero_extendhisi2): Likewise.
	(extendqihi2): Likewise.
	(extendqisi2): Likewise.
	(extendhisi2): Likewise.
	(addsi3): Likewise.
	(subsi3): Likewise.
	(andsi3): Likewise.
	* config/arc/constraints.md (Usd): Change it to memory constraint.

gcc/testsuite
2018-01-18  Claudiu Zissulescu  <claziss@synopsys.com>

	* gcc.target/arc/interrupt-8.c: Update test.
	* gcc.target/arc/loop-4.c: Likewise.
	* gcc.target/arc/loop-hazard-1.c: Likewise.
	* gcc.target/arc/sdata-3.c: Likewise.

From-SVN: r259763