radv: Align large buffers to the fragment size.
Improves performance in Talos by about 15% (and significant improvements in RotR and possibly other but did not bench with final patch) on kernel 4.19 and earlier. On 4.20+ a similar effect comes from 433ca054949a "drm/amdgpu: try allocating VRAM as power of two" v2: Do not impact the alignment of the physical memory. Reviewed-by:Dave Airlie <airlied@redhat.com> Reviewed-by:
Samuel Pitoiset <samuel.pitoiset@gmail.com> CC: <mesa-stable@lists.freedesktop.org> (cherry picked from commit 6569644b)
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