Integrate LLVM at llvm/llvm-project@b048b1b769aa
Integrate LLVM at llvm/llvm-project@b048b1b769aa

Updates LLVM usage to match
[b048b1b769aa](https://github.com/llvm/llvm-project/commit/b048b1b769aa)

PiperOrigin-RevId: 486999848

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