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FileCheck is required for OpenMP tests. The current detection can fail if building OpenMP in-tree when user sets `LLVM_INSTALL_TOOLCHAIN_ONLY=ON`. As a result, CMake will raise an error and the compilation will be broken. This patch fixed the issue. When `FileCheck` is not a target, tests will just be skipped. Reviewed By: jdoerfert, JonChesterfield Differential Revision: https://reviews.llvm.org/D95689