Convert fmaf to a generic implementation
#499
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Introduce a version of generic `fma` that works when there is a larger hardware-backed float type available to compute the result with more precision. This is currently used only for `f32`, but with some minor adjustments it should work for `f16` as well.
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Introduce a version of generic
fmathat works when there is a larger hardware-backed float type available to compute the result with more precision. This is currently used only forf32, but with some minor adjustments it should work forf16as well.