[GCC][PATCH][AArch64]Add ACLE intrinsics for bfdot for ARMv8.6 Extension

[GCC][PATCH][AArch64]Add ACLE intrinsics for bfdot for ARMv8.6 Extension

2020-01-16  Stam Markianos-Wright  <stam.markianos-wright@arm.com>

	* config/aarch64/aarch64-simd-builtins.def (aarch64_bfdot,
	aarch64_bfdot_lane, aarch64_bfdot_laneq): New.
	* config/aarch64/aarch64-simd.md (aarch64_bfdot, aarch64_bfdot_lane,
	aarch64_bfdot_laneq): New.
	* config/aarch64/arm_bf16.h (vbfdot_f32, vbfdotq_f32,
	vbfdot_lane_f32, vbfdotq_lane_f32, vbfdot_laneq_f32,
	vbfdotq_laneq_f32): New.
	* config/aarch64/iterators.md (UNSPEC_BFDOT, Vbfdottype,
	VBFMLA_W, VBF): New.
	(isquadop): Add V4BF, V8BF.

2020-01-16  Stam Markianos-Wright  <stam.markianos-wright@arm.com>

	* gcc.target/aarch64/advsimd-intrinsics/bfdot-1.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/bfdot-2.c: New.
	* gcc.target/aarch64/advsimd-intrinsics/bfdot-3.c: New.