Integrate LLVM at llvm/llvm-project@1983acce7c4d
Integrate LLVM at llvm/llvm-project@1983acce7c4d

Updates LLVM usage to match
[1983acce7c4d](https://github.com/llvm/llvm-project/commit/1983acce7c4d)

PiperOrigin-RevId: 343260267

google-research/structured-additive-IR,google-research/structured-additive-IR