Merge google -> main (#7000)

* 1f06d1fcf Merge pull request #6998 from ScottTodd:main-to-google
* 411c6a442 Synchronize submodules with LLVM at llvm/llvm-project@1524b0154116
* 20294e2b9 Integrate LLVM at llvm/llvm-project@1524b0154116
* e1fef8e9c Integrate LLVM at llvm/llvm-project@89786c2b992c
* 89e9de8ad Integrate LLVM at llvm/llvm-project@2bf8be79b10c