glsl: nir: zink: r600: nir: spirv: d3d12: radeonsi: Try to fix all the issues with sparseTextureGatherOffsetARB (and textureGatherOffsets changes too)

There were a lot of problems. ☹ With this MR (and some hacks to force zink to use sparse no matter what), I can compile the test shader from #6365 (closed) until it gets inside the Intel driver. Since the Intel Vulkan driver doesn't support the right sparse things, it crashes. 🤷 There has been no testing other than that. It should be... better than it was before.

It is marked Draft until someone with access to a full sparse texture implementation can validate it.