arm: Auto-vectorization for MVE: vorr

arm: Auto-vectorization for MVE: vorr

This patch enables MVE vorrq instructions for auto-vectorization.  MVE
vorrq insns in mve.md are modified to use ior instead of unspec
expression to support ior<mode>3.  The ior<mode>3 expander is added to
vec-common.md

2020-12-03  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/
	* config/arm/iterators.md (supf): Remove VORRQ_S and VORRQ_U.
	(VORRQ): Remove.
	* config/arm/mve.md (mve_vorrq_s<mode>): New entry for vorr
	instruction using expression ior.
	(mve_vorrq_u<mode>): New expander.
	(mve_vorrq_f<mode>): Use ior code instead of unspec.
	* config/arm/neon.md (ior<mode>3): Renamed into ior<mode>3_neon.
	* config/arm/predicates.md (imm_for_neon_logic_operand): Enable
	for MVE.
	* config/arm/unspecs.md (VORRQ_S, VORRQ_U, VORRQ_F): Remove.
	* config/arm/vec-common.md (ior<mode>3): New expander.

	gcc/testsuite/
	* gcc.target/arm/simd/mve-vorr.c: Add vorr tests.