Justice Adams af61b8e8f1
[cmake] Add check_linker_flag import (#85128)
Fixing

```
CMake Error at cmake/llvm/AddLLVM.cmake:266 (check_linker_flag):
  Unknown CMake command "check_linker_flag".
```
2024-03-13 14:42:04 -07:00
..

See docs/CMake.html for instructions on how to build LLVM with CMake.