fpu/softfloat: Pass FloatClass to pickNaNMulAdd
For each operand, pass a single enumeration instead of a pair of booleans. The commit also merges multiple different ifdef-selected implementations of pickNaNMulAdd into a single function whose body is ifdef-selected. Tested-by: NAlex Bennée <alex.bennee@linaro.org> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
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