Use mul_add with a float inversion instead of mul_neg_add #57
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The code is more readable that way and also more portable to other SIMD libraries; wide is the only one with mul_neg_add. After my Lokathor/wide#242 this generates identical assembly to mul_neg_add on AVX2, AVX-512 and NEON
Prerequisite for porting to fearless_simd since my PR for mul_neg_add got rejected: linebender/fearless_simd#162