Integrate LLVM at llvm/llvm-project@d8415b02a519
Integrate LLVM at llvm/llvm-project@d8415b02a519

Updates LLVM usage to match
[d8415b02a519](https://github.com/llvm/llvm-project/commit/d8415b02a519)

PiperOrigin-RevId: 481275732

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