Merge google -> main (#2468)

* defa1d92 Synchronize submodules                                                          
* a626b68e Update TF Submodule and LLVM BUILD files.                                       
* ae90fc5d Synchronize submodules                                                          
* a29d6a97 Integrate LLVM at https://github.com/llvm/llvm-project/commit/c2a61ef38850      
* 07c9af56 Merge pull request #2462 from GMNGeoffrey:main-to-google