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Kenneth Graunke requested to merge kwg/mesa:iris-shareable-shaders into master

This switches iris from storing shader variants in a per-context hash table to storing them globally in the pipe_shader_state itself, meaning that we can use them across contexts. This allows apps to compile in one context and draw with them in another, instead of having to recompile. It also simplifies tear down in st/mesa. Furthermore, it eliminates hash table lookup overhead when looking up shader variants.

Cc @idr

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