[ARC] Add/update combiner patterns.

[ARC] Add/update combiner patterns.

gcc/
2018-01-26  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.md (add_shift): New pattern.
	(add_shift2): Likewise.
	(sub_shift): Likewise.
	(sub_shift_cmp0_noout): Likewise.
	(compare_si_ashiftsi): Likewise.
	(xbfu_cmp0_noout): New combine pattern.
	(xbfu_cmp0"): Likewise.
	(movsi_set_cc_insn): Place the predicable variant first.
	(commutative_binary_cmp0_noout): Remove clobber.
	(commutative_binary_cmp0): New pattern.
	(noncommutative_binary_cmp0): Likewise.
	(noncommutative_binary_cmp0_noout): Likewise.
	(noncommutative_binary_comparison_result_used): Removed.
	(rsub_cmp0): New pattern.
	(rsub_cmp0_noout): Likewise.
	(extzvsi): Changed, keep only meaningful variants.
	(SQH, SEZ): New iterators.
	(SQH_postfix): New mode attribute.
	(SEZ_prefix): New code attribute.
	(<SEZ_prefix>xt<SQH_postfix>_cmp0_noout): New instruction pattern.
	(<SEZ_prefix>xt<SQH_postfix>_cmp0): Likewise.
	* config/arc/predicates.md (cc_set_register): Use CC_REG instead
	of numerical value.
	(noncommutative_operator): Check the availability of barrel
	shifter option.

From-SVN: r259237