bifrost: Add support for min/max mode and rounding mode
We split the original TwoSrcFmod category in two, since the two unknown bits can mean two different things. They either specify the rounding mode or the min/max mode. The nan_wins mode is used for implementing exp() and exp2(), although the other 2 non-default modes are sadly unused by the compiler. The different rounding modes aren't used for GL, although apparently they can be used in OpenCL.
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