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iris: avoid use after free in shader destruction

Dave Airlie requested to merge airlied/mesa:iris-shader-destroy into master

While playing with compute shaders, I was getting a random crash, noticed that bind_state was using the old shader info for comparision, but gallium allows the shader to be deleted while bound, so this could lead to a use after free.

This can't happen using the cso cache. As it tracks all of this.

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