arm: improve tests for vabavq*

gcc/testsuite/ChangeLog:

	* gcc.target/arm/mve/intrinsics/vabavq_p_s16.c: Improve test.
	* gcc.target/arm/mve/intrinsics/vabavq_p_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_p_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_p_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_p_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_p_u8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vabavq_u8.c: Likewise.
12 files changed