[llvm] [GlobalISel] Avoid redundant copy for zero-offset GEPs (PR #203029)

[Cullen Rhodes via llvm-commits]

c-rhodes wrote:

> Where do these come from? Can we fold such GEPs in the IRBuilder folder to prevent them from being emitted by Clang in the first place? (Is there already some precedent for things like this? cc @nikic)

it's a fair point and I haven't looked into it but I still think this makes sense


https://github.com/llvm/llvm-project/pull/203029