Integrate LLVM at llvm/llvm-project@a61c0adba194
Integrate LLVM at llvm/llvm-project@a61c0adba194

Updates LLVM usage to match
[a61c0adba194](https://github.com/llvm/llvm-project/commit/a61c0adba194)

PiperOrigin-RevId: 401578062

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