[llvm] [SPIR-V] Address the case when optimization uses GEP operator and GenCode creates G_PTR_ADD to convey the semantics (PR #107880)

[Vyacheslav Levytskyy via llvm-commits]

https://github.com/VyacheslavLevytskyy closed https://github.com/llvm/llvm-project/pull/107880