Hi,

The ACLE defines mve_pred16_t as an unsigned short.  This patch makes 
sure GCC treats the predicate as an unsigned type, rather than signed.

Bootstrapped on aarch64-none-eabi and regression tested on arm-none-eabi 
and armeb-none-eabi for armv8.1-m.main+mve.fp.

OK for trunk?

gcc/ChangeLog:

	PR target/107674
	* config/arm/arm-builtins.cc (arm_simd_builtin_type): Rewrite to use
	new qualifiers parameter and use unsigned short type for MVE predicate.
	(arm_init_builtin): Call arm_simd_builtin_type with qualifiers
	parameter.
	(arm_init_crypto_builtins): Likewise.

gcc/testsuite/ChangeLog:

	PR target/107674
	* gcc.target/arm/mve/mve_vpt.c: New test.