[Clang][CodeGen] Respect -fwrapv-pointer when emitting struct GEPs (#134269)
This patch turns off inbounds/nuw flags for member accesses when
`-fwrapv-pointer` is set.
Closes https://github.com/llvm/llvm-project/issues/132449.
It is required by https://github.com/llvm/llvm-project/pull/130734.