Integrate LLVM at llvm/llvm-project@6697e3354fbe
Integrate LLVM at llvm/llvm-project@6697e3354fbe

Updates LLVM usage to match
[6697e3354fbe](https://github.com/llvm/llvm-project/commit/6697e3354fbe)

PiperOrigin-RevId: 438276338

tensorflow/runtime,tensorflow/runtime,tensorflow/runtime,tensorflow/runtime