thread, grid, and block dim/idx can only return non-negative values #1973
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Based on the previous discussion in
https://rust-lang.zulipchat.com/#narrow/channel/422870-t-compiler.2Fgpgpu-backend/topic/Return.20type.20of.20NVPTX.20index.20and.20dimension.20intrinsics
Also matching amdgpu: https://doc.rust-lang.org/nightly/core/arch/amdgpu/fn.workitem_id_x.html
r? @workingjubilee