arm: Auto-vectorization for MVE: vand

arm: Auto-vectorization for MVE: vand

This patch enables MVE vandq instructions for auto-vectorization.  MVE
vandq insns in mve.md are modified to use 'and' instead of unspec
expression to support and<mode>3.  The and<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 VANDQ_S and VANDQ_U.
	(VANQ): Remove.
	(VDQ): Add TARGET_HAVE_MVE condition where relevant.
	* config/arm/mve.md (mve_vandq_u<mode>): New entry for vand
	instruction using expression 'and'.
	(mve_vandq_s<mode>): New expander.
	(mve_vaddq_n_f<mode>): Use 'and' code instead of unspec.
	* config/arm/neon.md (and<mode>3): Rename into and<mode>3_neon.
	* config/arm/predicates.md (imm_for_neon_inv_logic_operand):
	Enable for MVE.
	* config/arm/unspecs.md (VANDQ_S, VANDQ_U, VANDQ_F): Remove.
	* config/arm/vec-common.md (and<mode>3): New expander.

	gcc/testsuite/
	* gcc.target/arm/simd/mve-vand.c: New test.