Round the ExactFloat so that its mantissa has at most "max_prec" bits using the given rounding mode. Requires "max_prec" to be at least 2 (since kRoundTiesToEven doesn't make sense with fewer bits than this).
See Implementation
Round the ExactFloat so that its mantissa has at most "max_prec" bits using the given rounding mode. Requires "max_prec" to be at least 2 (since kRoundTiesToEven doesn't make sense with fewer bits than this).