Integrate LLVM at llvm/llvm-project@8561e15c5bef
Integrate LLVM at llvm/llvm-project@8561e15c5bef

Updates LLVM usage to match
[8561e15c5bef](https://github.com/llvm/llvm-project/commit/8561e15c5bef)

PiperOrigin-RevId: 416817383

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