Add additional FMA tests - #1439
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unless SIMDE_FAST_MATH is defined, then we can use the presumed faster route with intermediate rounding
to avoid
../simde/arm/neon/ld2.h:455:25: error: ‘r_[1].simde_float16x4_private::values’ is used uninitialized [-Werror=uninitialized]
455 | r_[i].values[j] = ptr[i + (j * (sizeof(r_) / sizeof(r_[0])))];
| ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
on gcc 12.4.0 "i686-linux-gnu-gcc-12 (Debian 12.4.0-5) 12.4.0"
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inspired by https://shnatsel.github.io/implementing-fma-finding-bugs-in-std/