Integrate LLVM at llvm/llvm-project@bb907b26e2bf
Integrate LLVM at llvm/llvm-project@bb907b26e2bf

Updates LLVM usage to match
[bb907b26e2bf](https://github.com/llvm/llvm-project/commit/bb907b26e2bf)

PiperOrigin-RevId: 368850216

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