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This change is relevant when embedding the llvm cmake project into another project. It should not change the build behavior of a normal llvm build. In the case where llvm is embedded as a cmake subproject, CMAKE_SOURCE_DIR does not point to the expected directory and building the tests fails. Using CMAKE_CURRENT_SOURCE_DIR fixes this problem, as it will always point to the same directory. Differential Revision: https://reviews.llvm.org/D73466