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llvmpipe: Compile sample functioins on demand

Konstantin Seurer requested to merge KonstantinSeurer/mesa:lavapipe-on-demand-texture-functions into main 
The way this was implemented wasn't optimal. Compiling a functrion for
each lp_static_texture_state/lp_static_sampler_state/sample_key
combination is not great. This patch tries to contain the combinatory
explosion by compiling sample functions on demand inside the shader,
caching them and moving them to their intended locations when no chader
is running.

Improves CTS runtime by a lot.

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