arm: Add vldN_lane_bf16 + vldNq_lane_bf16 intrisics

arm: Add vldN_lane_bf16 + vldNq_lane_bf16 intrisics

gcc/ChangeLog

2020-10-29  Andrea Corallo  <andrea.corallo@arm.com>

	* config/arm/arm_neon.h (vld2_lane_bf16, vld2q_lane_bf16)
	(vld3_lane_bf16, vld3q_lane_bf16, vld4_lane_bf16)
	(vld4q_lane_bf16): Add intrinsics.
	* config/arm/arm_neon_builtins.def: Touch for:
	__builtin_neon_vld2_lanev4bf, __builtin_neon_vld2_lanev8bf,
	__builtin_neon_vld3_lanev4bf, __builtin_neon_vld3_lanev8bf,
	__builtin_neon_vld4_lanev4bf, __builtin_neon_vld4_lanev8bf.
	* config/arm/iterators.md (VQ_HS): Add V8BF to the iterator.

gcc/testsuite/ChangeLog

2020-10-29  Andrea Corallo  <andrea.corallo@arm.com>

	* gcc.target/aarch64/advsimd-intrinsics/vld2_lane_bf16_indices_1.c:
	Run it also for the arm backend.
	* gcc.target/aarch64/advsimd-intrinsics/vld2q_lane_bf16_indices_1.c:
	Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vld3_lane_bf16_indices_1.c:
	Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vld3q_lane_bf16_indices_1.c:
	Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vld4_lane_bf16_indices_1.c:
	Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vld4q_lane_bf16_indices_1.c:
	Likewise.
	* gcc.target/arm/simd/vldn_lane_bf16_1.c: New test.