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amdgpu: reduce amdgpu_winsys_bo size

Pierre-Eric Pelloux-Prayer requested to merge pepp/mesa:amdgpu_bo_reduce_size into master

This MR reduces struct amdgpu_winsys_bo' size: 208 bytes -> 168 bytes.

This improves performance in some SPECviewperf13 (tested on top of !7078 (merged)). For instance in subtest10, fps change is: 230 -> 280.

A sysprof capture shows that the percentage of total samples in amdgpu_cs_add_buffer decreases from 23% to 16%.

The LIST_FOR_EACH_ENTRY_PTR from the 1st commit is a bit ugly... let me know if you prefer to move this to list.h.

Edited by Pierre-Eric Pelloux-Prayer

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