arm: Remove coercion from scalar argument to vmin & vmax intrinsics

arm: Remove coercion from scalar argument to vmin & vmax intrinsics

This patch fixes an issue with vmin* and vmax* intrinsics which accept
a scalar argument. Previously when the scalar was of different width
to the vector elements this would generate __ARM_undef. This change
allows the scalar argument to be implicitly converted to the correct
width. Also tidied up the relevant unit tests, some of which would
have passed even if only one of two or three intrinsic calls had
compiled correctly.

Bootstrapped and tested on arm-none-eabi, gcc and CMSIS_DSP
testsuites are clean. OK for trunk?

Thanks,
Joe

gcc/ChangeLog:

2020-08-10  Joe Ramsay  <joe.ramsay@arm.com>

	* config/arm/arm_mve.h (__arm_vmaxnmavq): Remove coercion of scalar
	argument.
	(__arm_vmaxnmvq): Likewise.
	(__arm_vminnmavq): Likewise.
	(__arm_vminnmvq): Likewise.
	(__arm_vmaxnmavq_p): Likewise.
	(__arm_vmaxnmvq_p): Likewise (and delete duplicate definition).
	(__arm_vminnmavq_p): Likewise.
	(__arm_vminnmvq_p): Likewise.
	(__arm_vmaxavq): Likewise.
	(__arm_vmaxavq_p): Likewise.
	(__arm_vmaxvq): Likewise.
	(__arm_vmaxvq_p): Likewise.
	(__arm_vminavq): Likewise.
	(__arm_vminavq_p): Likewise.
	(__arm_vminvq): Likewise.
	(__arm_vminvq_p): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/arm/mve/intrinsics/vmaxavq_p_s16.c: Add test for mismatched
	width of scalar argument.
	* gcc.target/arm/mve/intrinsics/vmaxavq_p_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxavq_p_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxavq_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxavq_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxavq_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxnmavq_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxnmavq_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxnmavq_p_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxnmavq_p_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxnmvq_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxnmvq_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxnmvq_p_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxnmvq_p_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxvq_p_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxvq_p_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxvq_p_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxvq_p_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxvq_p_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxvq_p_u8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxvq_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxvq_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxvq_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxvq_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxvq_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vmaxvq_u8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminavq_p_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminavq_p_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminavq_p_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminavq_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminavq_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminavq_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminnmavq_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminnmavq_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminnmavq_p_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminnmavq_p_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminnmvq_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminnmvq_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminnmvq_p_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminnmvq_p_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminvq_p_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminvq_p_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminvq_p_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminvq_p_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminvq_p_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminvq_p_u8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminvq_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminvq_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminvq_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminvq_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminvq_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vminvq_u8.c: Likewise.