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nak: Implement fmulz and ffmaz

Faith Ekstrand requested to merge gfxstrand/mesa:nak/fmulz into main

Unfortunately, this involves touching core NIR a bit as we can't do fmulz with denorms preserved. The DNZ bit implies FTZ so we have to tell NIR to only optimize of the client hasn't explicitly requested denorms. Fortunately, the one user of this is DXVK D3D9 and it never wants denorms anyway.

Closes: #10261 (closed)

Edited by Faith Ekstrand

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