Integrate LLVM at llvm/llvm-project@9df19ce40281
Integrate LLVM at llvm/llvm-project@9df19ce40281

Updates LLVM usage to match
[9df19ce40281](https://github.com/llvm/llvm-project/commit/9df19ce40281)

Reverts e5c11f3d1e1bef39cb1ea0937ac5addf04942f32
