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Causes Portal to go from 85FPS to 120FPS on Lenovo X13s. When running in 32-bit mode we were wasting 8 GPRs and 8 FPRs by still allocating the top 8 registers of each even though 32-bit can't use them. Reallocate them to be register allocated registers when running 32-bit applications which reduces spills and lowers the cost of spilling/filling SRA registers. Quite a significant speed boost for a little bit of work.