CMake error when trying to build

Hi, I am trying to build torch mlir having followed your instructions at the following page https://github.com/llvm/torch-mlir/blob/main/docs/development.md.

When I try to run an example I receive a segmentation fault. When I try to reload the cmakeLists in Clion the following error appears

```
-- LLVM and MLIR packages have already been configured.
CMake Error at build/cmake_build/lib/cmake/llvm/AddLLVM.cmake:965 (add_executable):
add_executable cannot create target "torch-mlir-dialects-opt" because an
imported target with the same name already exists.
Call Stack (most recent call first):
build/cmake_build/lib/cmake/llvm/AddLLVM.cmake:1338 (add_llvm_executable)
build/cmake_build/lib/cmake/llvm/AddLLVM.cmake:1363 (llvm_add_tool)
externals/llvm-external-projects/torch-mlir-dialects/tools/torch-mlir-dialects-opt/CMakeLists.txt:16 (add_llvm_tool)

CMake Error at build/cmake_build/lib/cmake/llvm/LLVM-Config.cmake:107 (target_link_libraries):
Cannot specify link libraries for target "torch-mlir-dialects-opt" which is
not built by this project.
Call Stack (most recent call first):
build/cmake_build/lib/cmake/llvm/LLVM-Config.cmake:95 (explicit_llvm_config)
build/cmake_build/lib/cmake/llvm/AddLLVM.cmake:1014 (llvm_config)
build/cmake_build/lib/cmake/llvm/AddLLVM.cmake:1338 (add_llvm_executable)
build/cmake_build/lib/cmake/llvm/AddLLVM.cmake:1363 (llvm_add_tool)
externals/llvm-external-projects/torch-mlir-dialects/tools/torch-mlir-dialects-opt/CMakeLists.txt:16 (add_llvm_tool)

-- Configuring incomplete, errors occurred!
See also "/Users/dvlpr/CLionProjects/torch-mlir/cmake-build-debug/CMakeFiles/CMakeOutput.log".
See also "/Users/dvlpr/CLionProjects/torch-mlir/cmake-build-debug/CMakeFiles/CMakeError.log".

[Failed to reload]
```

I had another error before, the file about MLIRConfig.cmake not found but I solved it by adding this to the cmake

```
set(MLIR_DIR /Users/dvlpr/CLionProjects/torch-mlir/build/lib/cmake/mlir)
```

Start with docs/development.md and externals/llvm-external-projects/torch-mlir-dialects/tools/torch-mlir-dialects-opt/CMakeLists.txt, then inspect the reported CMake configuration logs. Determine why the torch-mlir-dialects-opt target is already imported when the tool is added; done means the documented build and CLion reload complete without these configuration errors.

Written by the indexing model from the issue text.