[PATCH] CMake: Automatically pick up subdirectories in llvm/tools as 'external projects' if they contain a 'CMakeLists.txt' file

[Argyrios Kyrtzidis]

Hi,

The attached patch allows CMake to pick up external projects in llvm/tools without the need to modify the "llvm/tools/CMakeLists.txt" file.
This makes it easier to work with projects that live in other repositories, without needing to specify each one in "llvm/tools/CMakeLists.txt".

Please review.

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