Integrate LLVM at llvm/llvm-project@4602f52d482c
Integrate LLVM at llvm/llvm-project@4602f52d482c

Updates LLVM usage to match
[4602f52d482c](https://github.com/llvm/llvm-project/commit/4602f52d482c)

PiperOrigin-RevId: 409519981

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