[AArch64] arm_neon.h - add vpaddd_f64, vpaddd_s64, vpaddd_u64 intrinsics

[AArch64] arm_neon.h - add vpaddd_f64, vpaddd_s64, vpaddd_u64 intrinsics

gcc/

	* config/aarch64/arm_neon.h (vpadd_<suf><8,16,32,64>): Move to
	correct alphabetical position.
	(vpaddd_f64): Rewrite using builtins.
	(vpaddd_s64): Move to correct alphabetical position.
	(vpaddd_u64): New.

gcc/testsuite/

	* gcc.target/aarch64/scalar_intrinsics.c (test_vpaddd_f64): New.
	(test_vpaddd_s64): Likewise.
	(test_vpaddd_s64): Likewise.
	* gcc.target/aarch64/simd/vpaddd_f64: New.
	* gcc.target/aarch64/simd/vpaddd_s64: New.
	* gcc.target/aarch64/simd/vpaddd_u64: New.

From-SVN: r213382