arm: [MVE intrinsics] factorize several binary operations

Factorize vabdq, vhaddq, vhsubq, vmulhq, vqaddq_u, vqdmulhq,
vqrdmulhq, vqrshlq, vqshlq, vqsubq_u, vrhaddq, vrmulhq, vrshlq
so that they use the same pattern.

2022-09-08  Christophe Lyon <christophe.lyon@arm.com>

	gcc/
	* config/arm/iterators.md (MVE_INT_SU_BINARY): New.
	(mve_insn): Add vabdq, vhaddq, vhsubq, vmulhq, vqaddq, vqdmulhq,
	vqrdmulhq, vqrshlq, vqshlq, vqsubq, vrhaddq, vrmulhq, vrshlq.
	(supf): Add VQDMULHQ_S, VQRDMULHQ_S.
	* config/arm/mve.md (mve_vabdq_<supf><mode>)
	(@mve_vhaddq_<supf><mode>, mve_vhsubq_<supf><mode>)
	(mve_vmulhq_<supf><mode>, mve_vqaddq_<supf><mode>)
	(mve_vqdmulhq_s<mode>, mve_vqrdmulhq_s<mode>)
	(mve_vqrshlq_<supf><mode>, mve_vqshlq_<supf><mode>)
	(mve_vqsubq_<supf><mode>, @mve_vrhaddq_<supf><mode>)
	(mve_vrmulhq_<supf><mode>, mve_vrshlq_<supf><mode>): Merge into
	...
	(@mve_<mve_insn>q_<supf><mode>): ... this.
	* config/arm/vec-common.md (avg<mode>3_floor, uavg<mode>3_floor)
	(avg<mode>3_ceil, uavg<mode>3_ceil): Use gen_mve_q instead of
	gen_mve_vhaddq / gen_mve_vrhaddq.