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c0011f027d
Add an option to specify additional linker flags for unit tests only. For example, this allows using something like -DLLVM_UNITTEST_LINK_FLAGS="-Wl,-plugin-opt=O0" if you're doing LTO builds, or -DLLVM_UNITTEST_LINK_FLAGS="-fno-lto" if you're using fat LTO objects. The build system already does this itself if the LLVM_ENABLE_LTO flag is used, but this does not cover all possible LTO configurations. Differential Revision: https://reviews.llvm.org/D154212
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