Integrate LLVM at llvm/llvm-project@99f00635d7ac
Integrate LLVM at llvm/llvm-project@99f00635d7ac

Updates LLVM usage to match
[99f00635d7ac](https://github.com/llvm/llvm-project/commit/99f00635d7ac)

PiperOrigin-RevId: 383094091

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