gallium: Add a PIPE_CAP_NIR_COMPACT_ARRAYS capability bit.
Iris would like to use compact arrays for tesslevels and clip/cull distances. radeonsi will likely want to switch to these at some point, since it'll be necessary for GL_ARB_gl_spirv support, but it's not ready for them just yet. Reviewed-by: Timothy Arceri <firstname.lastname@example.org>
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