arm: improve tests and fix vnegq*

arm: improve tests and fix vnegq*

gcc/ChangeLog:

	* config/arm/mve.md (mve_vnegq_f<mode>, mve_vnegq_s<mode>):
	Fix spacing.

gcc/testsuite/ChangeLog:

	* gcc.target/arm/mve/intrinsics/vnegq_f16.c: Use
	check-function-bodies instead of scan-assembler checks.  Use
	extern "C" for C++ testing.
	* gcc.target/arm/mve/intrinsics/vnegq_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_m_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_m_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_m_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_m_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_m_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_x_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_x_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_x_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_x_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vnegq_x_s8.c: Likewise.
	* gcc.target/arm/simd/mve-vneg.c: Update test.
	* gcc.target/arm/simd/mve-vshr.c: Likewise