[AArch64] Idiomatic 64x1 comparisons in arm_neon.h

[AArch64] Idiomatic 64x1 comparisons in arm_neon.h

gcc/:

	* config/aarch64/arm_neon.h (vceq_s64, vceq_u64, vceqz_s64, vceqz_u64,
	vcge_s64, vcge_u64, vcgez_s64, vcgt_s64, vcgt_u64, vcgtz_s64, vcle_s64,
	vcle_u64, vclez_s64, vclt_s64, vclt_u64, vcltz_s64, vtst_s64,
	vtst_u64): Rewrite using gcc vector extensions.

gcc/testsuite/:

	* gcc.target/aarch64/singleton_intrinsics_1.c: Generalize regex to
	allow cmlt or sshr.

From-SVN: r222909