Added NaN-box check for rv32d_fcvt_d_s
Added NaN-box check for rv32d_fcvt_d_s

phillipstanleymarbell/sunflower-simulator,phillipstanleymarbell/sunflower-simulator,gemusehaken/sunflower-simulator,gemusehaken/sunflower-simulator,gemusehaken/sunflower-simulator,phillipstanleymarbell/sunflower-simulator,gemusehaken/sunflower-simulator,phillipstanleymarbell/sunflower-simulator,gemusehaken/sunflower-simulator,gemusehaken/sunflower-simulator,phillipstanleymarbell/sunflower-simulator,gemusehaken/sunflower-simulator,gemusehaken/sunflower-simulator,phillipstanleymarbell/sunflower-simulator,phillipstanleymarbell/sunflower-simulator,phillipstanleymarbell/sunflower-simulator