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NEON intrinsics for folding maximum

These intrinsics compare adjacent pairs of elements in two vectors, and copy the larger of each pair into the corresponding element in the result vector.

int8x8_t    vpmax_s8(int8x8_t a, int8x8_t b);        // VPMAX.S8 d0,d0,d0 
int16x4_t   vpmax_s16(int16x4_t a, int16x4_t b);     // VPMAX.S16 d0,d0,d0
int32x2_t   vpmax_s32(int32x2_t a, int32x2_t b);     // VPMAX.S32 d0,d0,d0
uint8x8_t   vpmax_u8(uint8x8_t a, uint8x8_t b);      // VPMAX.U8 d0,d0,d0 
uint16x4_t  vpmax_u16(uint16x4_t a, uint16x4_t b);   // VPMAX.U16 d0,d0,d0
uint32x2_t  vpmax_u32(uint32x2_t a, uint32x2_t b);   // VPMAX.U32 d0,d0,d0
float32x2_t vpmax_f32(float32x2_t a, float32x2_t b); // VPMAX.F32 d0,d0,d0