arm: improve tests for vcmlaq*

arm: improve tests for vcmlaq*

gcc/testsuite/ChangeLog:

	* gcc.target/arm/mve/intrinsics/vcmlaq_f16.c: Use
	check-function-bodies instead of scan-assembler checks.  Use
	extern "C" for C++ testing.
	* gcc.target/arm/mve/intrinsics/vcmlaq_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_m_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_m_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_rot180_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_rot180_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_rot180_m_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_rot180_m_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_rot270_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_rot270_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_rot270_m_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_rot270_m_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_rot90_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_rot90_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_rot90_m_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vcmlaq_rot90_m_f32.c: Likewise.