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anv,iris: Advertise a max 3D workgroup size of 1024^3

Faith Ekstrand requested to merge gfxstrand/mesa:review/workgroup-size-1024 into main

On GFX version 12.5+ with COMPUTE_WALKER, this is the limit based on the size of the HW packet. On older HW, we can technically go a bit bigger but there's not much point. Technically, some hardware can support a scalar workgroup size up to 2048 but most apps don't go any bigger than 1024.

Edited by Marcin Ślusarz

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