arm: [MVE] Remove illegal intrinsics (PR target/96914)

arm: [MVE] Remove illegal intrinsics (PR target/96914)

A few MVE intrinsics had an unsigned variant implement while they are
supported by the hardware.  This patch removes them:
__arm_vqrdmlashq_n_u8
__arm_vqrdmlahq_n_u8
__arm_vqdmlahq_n_u8
__arm_vqrdmlashq_n_u16
__arm_vqrdmlahq_n_u16
__arm_vqdmlahq_n_u16
__arm_vqrdmlashq_n_u32
__arm_vqrdmlahq_n_u32
__arm_vqdmlahq_n_u32
__arm_vmlaldavaxq_p_u32
__arm_vmlaldavaxq_p_u16

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

	gcc/
	PR target/96914
	* config/arm/arm_mve.h (vqrdmlashq_n_u8, vqrdmlashq_n_u16)
	(vqrdmlashq_n_u32, vqrdmlahq_n_u8, vqrdmlahq_n_u16)
	(vqrdmlahq_n_u32, vqdmlahq_n_u8, vqdmlahq_n_u16, vqdmlahq_n_u32)
	(vmlaldavaxq_p_u16, vmlaldavaxq_p_u32): Remove.
	* config/arm/arm_mve_builtins.def (vqrdmlashq_n_u, vqrdmlahq_n_u)
	(vqdmlahq_n_u, vmlaldavaxq_p_u): Remove.
	* config/arm/unspecs.md (VQDMLAHQ_N_U, VQRDMLAHQ_N_U)
	(VQRDMLASHQ_N_U)
	(VMLALDAVAXQ_P_U): Remove unspecs.
	* config/arm/iterators.md (VQDMLAHQ_N_U, VQRDMLAHQ_N_U)
	(VQRDMLASHQ_N_U, VMLALDAVAXQ_P_U): Remove attributes.
	(VQDMLAHQ_N, VQRDMLAHQ_N, VQRDMLASHQ_N, VMLALDAVAXQ_P): Remove
	unsigned variants from iterators.
	* config/arm/mve.md (mve_vqdmlahq_n_<supf><mode>)
	(mve_vqrdmlahq_n_<supf><mode>)
	(mve_vqrdmlashq_n_<supf><mode>, mve_vmlaldavaxq_p_<supf><mode>):
	Update comment.

	gcc/testsuite/
	PR target/96914
	* gcc.target/arm/mve/intrinsics/vmlaldavaxq_p_u16.c: Remove.
	* gcc.target/arm/mve/intrinsics/vmlaldavaxq_p_u32.c: Remove.
	* gcc.target/arm/mve/intrinsics/vqdmlahq_n_u16.c: Remove.
	* gcc.target/arm/mve/intrinsics/vqdmlahq_n_u32.c: Remove.
	* gcc.target/arm/mve/intrinsics/vqdmlahq_n_u8.c: Remove.
	* gcc.target/arm/mve/intrinsics/vqrdmlahq_n_u16.c: Remove.
	* gcc.target/arm/mve/intrinsics/vqrdmlahq_n_u32.c: Remove.
	* gcc.target/arm/mve/intrinsics/vqrdmlahq_n_u8.c: Remove.
	* gcc.target/arm/mve/intrinsics/vqrdmlashq_n_u16.c: Remove.
	* gcc.target/arm/mve/intrinsics/vqrdmlashq_n_u32.c: Remove.
	* gcc.target/arm/mve/intrinsics/vqrdmlashq_n_u8.c: Remove.

(cherry picked from commit 237f12da4124b91503646b099a8282aa6b251ef9)