Integrate LLVM at llvm/llvm-project@ea15b862d77e
Integrate LLVM at llvm/llvm-project@ea15b862d77e

Updates LLVM usage to match
[ea15b862d77e](https://github.com/llvm/llvm-project/commit/ea15b862d77e)

PiperOrigin-RevId: 416482963

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