LangRef: Fix minimumnum/maximumnum nan handling phrasing (#139228) Make this consistent with other operations with respect to signaling nan quieting. This was specifying that quieting is required, which is true for IEEE. Make this consistent with other IR operations, and signaling nan quieting is possible but optional in the case where there are two nan inputs. This permits directly selecting the intrinsic to the hardware instruction in the default floating-point environment for shaders.
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