[llvm] [AMDGPU] Occupancy w.r.t. workgroup size range is also a range (PR #123748)

[Shilei Tian via llvm-commits]

shiltian wrote:

I mean, when we compute occupancy (along) with workgroup size, such as the function `getOccupancyWithWorkGroupSizes` here. I might have missed where the attribute is used in the computation but if we don't factor it in, what's the point of having it?

https://github.com/llvm/llvm-project/pull/123748