If the varying descriptors will always be the same for a given shader
variant (certainly true if none of separable shaders, transform
feedback, or point sprites are used), we only need to link once. Now
that pan_pool supports both owned and unowned modes, we have the
flexibility to reuse the code path for both allocation strategies.
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10954>
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