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radv: adjust loop unrolling heuristics for int64

Rhys Perry requested to merge pendingchaos/mesa:radv_unroll_int64 into master

In particular, increase the cost of 64-bit integer division.

Fixes huge shaders with dEQP-VK.spirv_assembly.type.scalar.i64.mod_geom , with ACO used for GS this creates shaders requiring a branch with >32767 dword offset.

Edited by Rhys Perry

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