tests: add reproducer for mesa#2596
Issue is related to radeonsi live shader cache: cso_context unbinds a vertex shader that's going to be destroyed. Except that it shouldn't because the shader is ref-counted, and it won't actually be destroyed.
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Issue is related to radeonsi live shader cache: cso_context unbinds a vertex shader that's going to be destroyed. Except that it shouldn't because the shader is ref-counted, and it won't actually be destroyed.