Merge google -> main (#7353)

* fc8608058 Synchronize submodules with LLVM at llvm/llvm-project@fcbec7e
* a66bc660a Merge pull request #7352 from GMNGeoffrey:main-to-google
* 57e25c2c5 Integrate LLVM at llvm/llvm-project@fcbec7e668ec