re PR middle-end/91272 ([SVE] Use fully-masked loops for CLASTB reductions)

re PR middle-end/91272 ([SVE] Use fully-masked loops for CLASTB reductions)

2019-10-28  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	PR middle-end/91272
	* tree-vect-stmts.c (vectorizable_condition): Support
	EXTRACT_LAST_REDUCTION with fully-masked loops.

testsuite/
	* gcc.target/aarch64/sve/clastb_1.c: Add dg-scan.
	* gcc.target/aarch64/sve/clastb_2.c: Likewise.
	* gcc.target/aarch64/sve/clastb_3.c: Likewise.
	* gcc.target/aarch64/sve/clastb_4.c: Likewise.
	* gcc.target/aarch64/sve/clastb_5.c: Likewise.
	* gcc.target/aarch64/sve/clastb_6.c: Likewise.
	* gcc.target/aarch64/sve/clastb_7.c: Likewise.
	* gcc.target/aarch64/sve/clastb_8.c: Likewise.

From-SVN: r277524