arm: [MVE[ Add vqdmlashq intrinsics (PR target/96914)

arm: [MVE[ Add vqdmlashq intrinsics (PR target/96914)

This patch adds:
vqdmlashq_m_n_s16
vqdmlashq_m_n_s32
vqdmlashq_m_n_s8
vqdmlashq_n_s16
vqdmlashq_n_s32
vqdmlashq_n_s8

2020-10-08  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/
	PR target/96914
	* config/arm/arm_mve.h (vqdmlashq, vqdmlashq_m): Define.
	* config/arm/arm_mve_builtins.def (vqdmlashq_n_s)
	(vqdmlashq_m_n_s,): New.
	* config/arm/unspecs.md (VQDMLASHQ_N_S, VQDMLASHQ_M_N_S): New
	unspecs.
	* config/arm/iterators.md (VQDMLASHQ_N_S, VQDMLASHQ_M_N_S): New
	attributes.
	(VQDMLASHQ_N): New iterator.
	* config/arm/mve.md (mve_vqdmlashq_n_, mve_vqdmlashq_m_n_s): New
	patterns.

	gcc/testsuite/
	PR target/96914
	* gcc.target/arm/mve/intrinsics/vqdmlashq_m_n_s16.c: New test.
	* gcc.target/arm/mve/intrinsics/vqdmlashq_m_n_s32.c: New test.
	* gcc.target/arm/mve/intrinsics/vqdmlashq_m_n_s8.c: New test.
	* gcc.target/arm/mve/intrinsics/vqdmlashq_n_s16.c: New test.
	* gcc.target/arm/mve/intrinsics/vqdmlashq_n_s32.c: New test.
	* gcc.target/arm/mve/intrinsics/vqdmlashq_n_s8.c: New test.