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[CMake] Fix Xcode build with LLVM_ENABLE_OBJLIB.
This amends chapuni's r246156 to handle an Xcode quirk, one even called out in the CMake documentation: Some native build systems may not like targets that have only object files, so consider adding at least one real source file to any target that references $<TARGET_OBJECTS:objlib>. I've limited the scope of this hack to Xcode for now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247305 91177308-0d34-0410-b5e6-96231b3b80d8