ae34440834
This moves the responsibility for cleaning up dead intrinsics from DXILFinalizeLinkage to DXILOpLowering, and moves DXILFinalizeLinkage back to it's pre-#136244 place in the pipeline. Doing this avoids issues with DXIL passes running on obviously dead code, and makes it more clear what DXILFinalizeLinkage is really doing. This also helps with the story for #134260, as cleaning up dead intrinsics doesn't make sense if this becomes a more generic pass. Note that test/CodeGen/DirectX/remove-dead-intriniscs.ll already covers most of the testing here. It'd be nice to have something that catches the regression from changing the pass ordering but I couldn't come up with anything that wouldn't be incredibly fragile. Fixes #138180.
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