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intel: Run the optimization before and after lowering int64

Faith Ekstrand requested to merge gfxstrand/mesa:review/intel-opt-after-int64 into master

For bindless SSBO access, we have to do 64-bit address calculations. On ICL and above, we don't have 64-bit integer support so we have to lower the address calculations to 32-bit arithmetic. If we don't run the optimization loop before lowering, we won't fold any of the address chain calculations before lowering 64-bit arithmetic and they aren't really foldable afterwards. This cuts the size of the generated code in the compute shader in dEQP-VK.ssbo.phys.layout.random.16bit.scalar.13 by around 30%.

Edited by Faith Ekstrand

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