Add inrange to getelementptr for vtable

[smeenai]

I'm tracking #569 (comment) here so we don't forget it. https://godbolt.org/z/9b4o1GKrK shows that OG CodeGen adds inrange to the getelementptr for the vtable address point, but CIRGen doesn't, so we should match OG at some point.

[FantasqueX]

First, we need to add inrange support in MLIR LLVMIR Dialect llvm/llvm-project#128031