Add DFGraph.cpp to cmake lists

llvm/lib/IR/CMakeLists.txt

@@ -11,6 +11,7 @@ add_llvm_library(LLVMCore
   DebugLoc.cpp
   DIBuilder.cpp
   Dominators.cpp
+  DFGraph.cpp
   Function.cpp
   GCOV.cpp
   GVMaterializer.cpp