arm: MVE: Factorize all vcmp* integer patterns

arm: MVE: Factorize all vcmp* integer patterns

After removing the signed and unsigned suffixes in the previous
patches, we can now factorize the vcmp* patterns: there is no longer
an asymmetry where operators do not have the same set of signed and
unsigned variants.

The will make maintenance easier.

MVE has a different set of vector comparison operators than Neon,
so we have to introduce dedicated iterators.

2021-05-10  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/
	* config/arm/iterators.md (MVE_COMPARISONS): New.
	(mve_cmp_op): New.
	(mve_cmp_type): New.
	* config/arm/mve.md (mve_vcmp<mve_cmp_op>q_<mode>): New, merge all
	mve_vcmp patterns.
	(mve_vcmpneq_<mode>, mve_vcmpcsq_n_<mode>, mve_vcmpcsq_<mode>)
	(mve_vcmpeqq_n_<mode>, mve_vcmpeqq_<mode>, mve_vcmpgeq_n_<mode>)
	(mve_vcmpgeq_<mode>, mve_vcmpgtq_n_<mode>, mve_vcmpgtq_<mode>)
	(mve_vcmphiq_n_<mode>, mve_vcmphiq_<mode>, mve_vcmpleq_n_<mode>)
	(mve_vcmpleq_<mode>, mve_vcmpltq_n_<mode>, mve_vcmpltq_<mode>)
	(mve_vcmpneq_n_<mode>, mve_vcmpltq_n_<mode>, mve_vcmpltq_<mode>)
	(mve_vcmpneq_n_<mode>): Remove.