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turnip: Make sure that SNORM blits don't clamp ambiguous -1.0 values.

Emma Anholt requested to merge anholt/mesa:tu-snorm into main 
    The CTS expects that some paths transfer SNORM data exactly, but the HW
    will clamp 0x80 values to 0x81 in the process.  We can treat snorm as
    unorm, though, and get working compression without the clamping happening.
Edited by Emma Anholt

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