[clang] [clang] Generate nuw GEPs for struct member accesses (PR #99538)

[Hari Limaye via cfe-commits]

hazzlim wrote:

This seemed like the right place to make the change - please let me know if not!
 
I've not restricted this to a subset of languages because it seems fairly unambiguous that nuw holds for these inbounds struct member accesses, but it could be limited to e.g. C/C++ if that is more appropriate.

https://github.com/llvm/llvm-project/pull/99538