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This tool is used for SPGO and is invoked directly by users as described in the Clang User's Manual[^1]. This change will include llvm-profgen in installations configured with LLVM_INSTALL_TOOLCHAIN_ONLY, such as those provided by LLVM's executable Windows installers. This is useful now that LLVM can perform SPGO on Windows. [^1]: https://clang.llvm.org/docs/UsersManual.html#using-sampling-profilers
See docs/CMake.html for instructions on how to build LLVM with CMake.