[clang] [llvm] [IR] Add getelementptr nusw and nuw flags (PR #90824)

[Thorsten Schütt via cfe-commits]

tschuett wrote:

Could you please add a TODO here:
https://github.com/llvm/llvm-project/blob/e3f42b02a4129947ca2dd820bfb63ffed83027b7/llvm/lib/CodeGen/MachineInstr.cpp#L565
Thanks.

https://github.com/llvm/llvm-project/pull/90824