Fix #includes, so we include only what we really need.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175581 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/ScheduleDAG.h

@@ -17,11 +17,10 @@
 #define LLVM_CODEGEN_SCHEDULEDAG_H
 
 #include "llvm/ADT/BitVector.h"
-#include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/GraphTraits.h"
 #include "llvm/ADT/PointerIntPair.h"
 #include "llvm/ADT/SmallVector.h"
-#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/Target/TargetLowering.h"
 
 namespace llvm {