PR target/96313 AArch64: vqmovun* return types should be unsigned

PR target/96313 AArch64: vqmovun* return types should be unsigned

In this PR we have the wrong return type for some intrinsics. It should
be unsigned, but we implement it as signed.
Fix this by adjusting the type qualifiers used when creating the
builtins and fixing the type in the arm_neon.h intrinsic.
With the adjustment in qualifiers we now don't need to cast the result
when returning.

Bootstrapped and tested on aarch64-none-linux-gnu.

gcc/
	PR target/96313
	* config/aarch64/aarch64-simd-builtins.def (sqmovun): Use UNOPUS
	qualifiers.
	* config/aarch64/arm_neon.h (vqmovun_s16): Adjust builtin call.
	Remove unnecessary result cast.
	(vqmovun_s32): Likewise.
	(vqmovun_s64): Likewise.
	(vqmovunh_s16): Likewise.  Fix return type.
	(vqmovuns_s32): Likewise.
	(vqmovund_s64): Likewise.

gcc/testsuite/
	PR target/96313
	* gcc.target/aarch64/pr96313.c: New test.
	* gcc.target/aarch64/scalar_intrinsics.c (test_vqmovunh_s16):
	Adjust return type.
	(test_vqmovuns_s32): Likewise.
	(test_vqmovund_s64): Likewise.