Integrate LLVM at llvm/llvm-project@c962b3fdf8dd
Integrate LLVM at llvm/llvm-project@c962b3fdf8dd

Updates LLVM usage to match
[c962b3fdf8dd](https://github.com/llvm/llvm-project/commit/c962b3fdf8dd)

PiperOrigin-RevId: 424831960

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