[PATCH 3/3][AArch64] Idiomatic 64x1 comparisons in arm_neon.h

[Alan Lawrence]

This also makes the existing intrinsics tests apply to the new patterns.

Tested on aarch64-none-elf.

gcc/ChangeLog:

	* 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/ChangeLog:

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