This patch supports following MVE ACLE intrinsics with quaternary operands.

vsriq_m_n_s8, vsubq_m_s8, vsubq_x_s8, vcvtq_m_n_f16_u16, vcvtq_x_n_f16_u16,
vqshluq_m_n_s8, vabavq_p_s8, vsriq_m_n_u8, vshlq_m_u8, vshlq_x_u8, vsubq_m_u8,
vsubq_x_u8, vabavq_p_u8, vshlq_m_s8, vshlq_x_s8, vcvtq_m_n_f16_s16,
vcvtq_x_n_f16_s16, vsriq_m_n_s16, vsubq_m_s16, vsubq_x_s16, vcvtq_m_n_f32_u32,
vcvtq_x_n_f32_u32, vqshluq_m_n_s16, vabavq_p_s16, vsriq_m_n_u16,
vshlq_m_u16, vshlq_x_u16, vsubq_m_u16, vsubq_x_u16, vabavq_p_u16, vshlq_m_s16,
vshlq_x_s16, vcvtq_m_n_f32_s32, vcvtq_x_n_f32_s32, vsriq_m_n_s32, vsubq_m_s32,
vsubq_x_s32, vqshluq_m_n_s32, vabavq_p_s32, vsriq_m_n_u32, vshlq_m_u32,
vshlq_x_u32, vsubq_m_u32, vsubq_x_u32, vabavq_p_u32, vshlq_m_s32, vshlq_x_s32.

Please refer to M-profile Vector Extension (MVE) intrinsics [1]  for more details.
[1] https://developer.arm.com/architectures/instruction-sets/simd-isas/helium/mve-intrinsics

2020-03-18  Andre Vieira  <andre.simoesdiasvieira@arm.com>
            Mihail Ionescu  <mihail.ionescu@arm.com>
            Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

	* config/arm/arm-builtins.c (QUADOP_UNONE_UNONE_NONE_NONE_UNONE_QUALIFIERS):
	Define builtin qualifier.
	(QUADOP_NONE_NONE_NONE_NONE_UNONE_QUALIFIERS): Likewise.
	(QUADOP_NONE_NONE_NONE_IMM_UNONE_QUALIFIERS): Likewise.
	(QUADOP_UNONE_UNONE_UNONE_UNONE_UNONE_QUALIFIERS): Likewise.
	(QUADOP_UNONE_UNONE_NONE_IMM_UNONE_QUALIFIERS): Likewise.
	(QUADOP_NONE_NONE_UNONE_IMM_UNONE_QUALIFIERS): Likewise.
	(QUADOP_UNONE_UNONE_UNONE_IMM_UNONE_QUALIFIERS): Likewise.
	(QUADOP_UNONE_UNONE_UNONE_NONE_UNONE_QUALIFIERS): Likewise.
	* config/arm/arm_mve.h (vsriq_m_n_s8): Define macro.
	(vsubq_m_s8): Likewise.
	(vcvtq_m_n_f16_u16): Likewise.
	(vqshluq_m_n_s8): Likewise.
	(vabavq_p_s8): Likewise.
	(vsriq_m_n_u8): Likewise.
	(vshlq_m_u8): Likewise.
	(vsubq_m_u8): Likewise.
	(vabavq_p_u8): Likewise.
	(vshlq_m_s8): Likewise.
	(vcvtq_m_n_f16_s16): Likewise.
	(vsriq_m_n_s16): Likewise.
	(vsubq_m_s16): Likewise.
	(vcvtq_m_n_f32_u32): Likewise.
	(vqshluq_m_n_s16): Likewise.
	(vabavq_p_s16): Likewise.
	(vsriq_m_n_u16): Likewise.
	(vshlq_m_u16): Likewise.
	(vsubq_m_u16): Likewise.
	(vabavq_p_u16): Likewise.
	(vshlq_m_s16): Likewise.
	(vcvtq_m_n_f32_s32): Likewise.
	(vsriq_m_n_s32): Likewise.
	(vsubq_m_s32): Likewise.
	(vqshluq_m_n_s32): Likewise.
	(vabavq_p_s32): Likewise.
	(vsriq_m_n_u32): Likewise.
	(vshlq_m_u32): Likewise.
	(vsubq_m_u32): Likewise.
	(vabavq_p_u32): Likewise.
	(vshlq_m_s32): Likewise.
	(__arm_vsriq_m_n_s8): Define intrinsic.
	(__arm_vsubq_m_s8): Likewise.
	(__arm_vqshluq_m_n_s8): Likewise.
	(__arm_vabavq_p_s8): Likewise.
	(__arm_vsriq_m_n_u8): Likewise.
	(__arm_vshlq_m_u8): Likewise.
	(__arm_vsubq_m_u8): Likewise.
	(__arm_vabavq_p_u8): Likewise.
	(__arm_vshlq_m_s8): Likewise.
	(__arm_vsriq_m_n_s16): Likewise.
	(__arm_vsubq_m_s16): Likewise.
	(__arm_vqshluq_m_n_s16): Likewise.
	(__arm_vabavq_p_s16): Likewise.
	(__arm_vsriq_m_n_u16): Likewise.
	(__arm_vshlq_m_u16): Likewise.
	(__arm_vsubq_m_u16): Likewise.
	(__arm_vabavq_p_u16): Likewise.
	(__arm_vshlq_m_s16): Likewise.
	(__arm_vsriq_m_n_s32): Likewise.
	(__arm_vsubq_m_s32): Likewise.
	(__arm_vqshluq_m_n_s32): Likewise.
	(__arm_vabavq_p_s32): Likewise.
	(__arm_vsriq_m_n_u32): Likewise.
	(__arm_vshlq_m_u32): Likewise.
	(__arm_vsubq_m_u32): Likewise.
	(__arm_vabavq_p_u32): Likewise.
	(__arm_vshlq_m_s32): Likewise.
	(__arm_vcvtq_m_n_f16_u16): Likewise.
	(__arm_vcvtq_m_n_f16_s16): Likewise.
	(__arm_vcvtq_m_n_f32_u32): Likewise.
	(__arm_vcvtq_m_n_f32_s32): Likewise.
	(vcvtq_m_n): Define polymorphic variant.
	(vqshluq_m_n): Likewise.
	(vshlq_m): Likewise.
	(vsriq_m_n): Likewise.
	(vsubq_m): Likewise.
	(vabavq_p): Likewise.
	* config/arm/arm_mve_builtins.def
	(QUADOP_UNONE_UNONE_NONE_NONE_UNONE_QUALIFIERS): Use builtin qualifier.
	(QUADOP_NONE_NONE_NONE_NONE_UNONE_QUALIFIERS): Likewise.
	(QUADOP_NONE_NONE_NONE_IMM_UNONE_QUALIFIERS): Likewise.
	(QUADOP_UNONE_UNONE_UNONE_UNONE_UNONE_QUALIFIERS): Likewise.
	(QUADOP_UNONE_UNONE_NONE_IMM_UNONE_QUALIFIERS): Likewise.
	(QUADOP_NONE_NONE_UNONE_IMM_UNONE_QUALIFIERS): Likewise.
	(QUADOP_UNONE_UNONE_UNONE_IMM_UNONE_QUALIFIERS): Likewise.
	(QUADOP_UNONE_UNONE_UNONE_NONE_UNONE_QUALIFIERS): Likewise.
	* config/arm/mve.md (VABAVQ_P): Define iterator.
	(VSHLQ_M): Likewise.
	(VSRIQ_M_N): Likewise.
	(VSUBQ_M): Likewise.
	(VCVTQ_M_N_TO_F): Likewise.
	(mve_vabavq_p_<supf><mode>): Define RTL pattern.
	(mve_vqshluq_m_n_s<mode>): Likewise.
	(mve_vshlq_m_<supf><mode>): Likewise.
	(mve_vsriq_m_n_<supf><mode>): Likewise.
	(mve_vsubq_m_<supf><mode>): Likewise.
	(mve_vcvtq_m_n_to_f_<supf><mode>): Likewise.

gcc/testsuite/ChangeLog:

2020-03-18  Andre Vieira  <andre.simoesdiasvieira@arm.com>
            Mihail Ionescu  <mihail.ionescu@arm.com>
            Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

	* gcc.target/arm/mve/intrinsics/vabavq_p_s16.c: New test.
	* gcc.target/arm/mve/intrinsics/vabavq_p_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_p_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_p_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_p_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_p_u8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcvtq_m_n_f16_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcvtq_m_n_f16_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcvtq_m_n_f32_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcvtq_m_n_f32_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vqshluq_m_n_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vqshluq_m_n_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vqshluq_m_n_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vshlq_m_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vshlq_m_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vshlq_m_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vshlq_m_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vshlq_m_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vshlq_m_u8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsriq_m_n_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsriq_m_n_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsriq_m_n_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsriq_m_n_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsriq_m_n_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsriq_m_n_u8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsubq_m_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsubq_m_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsubq_m_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsubq_m_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsubq_m_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsubq_m_u8.c: Likewise.