[Modules] Move CFG.h to the IR library as it defines graph traits over

IR types.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202827 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/PostDominators.cpp

@@ -16,8 +16,8 @@
 #include "llvm/Analysis/PostDominators.h"
 #include "llvm/ADT/DepthFirstIterator.h"
 #include "llvm/ADT/SetOperations.h"
+#include "llvm/IR/CFG.h"
 #include "llvm/IR/Instructions.h"
-#include "llvm/Support/CFG.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/GenericDomTreeConstruction.h"
 using namespace llvm;