Support GPUs with less then 32 vertex buffers
A rebase of an old patchset (https://patchwork.freedesktop.org/series/8584/) with a few changes, to make Mesa work with GPUs with a low count of vertex buffers.
A rebase of an old patchset (https://patchwork.freedesktop.org/series/8584/) with a few changes, to make Mesa work with GPUs with a low count of vertex buffers.