Index: include/llvm/CodeGen/MachineScheduler.h
===================================================================
--- include/llvm/CodeGen/MachineScheduler.h
+++ include/llvm/CodeGen/MachineScheduler.h
@@ -228,6 +228,7 @@
 class ScheduleDAGMI : public ScheduleDAGInstrs {
 protected:
   AliasAnalysis *AA;
+  LiveIntervals *LIS;
   std::unique_ptr<MachineSchedStrategy> SchedImpl;
 
   /// Topo - A topological ordering for SUnits which permits fast IsReachable
@@ -255,9 +256,10 @@
 public:
   ScheduleDAGMI(MachineSchedContext *C, std::unique_ptr<MachineSchedStrategy> S,
                 bool RemoveKillFlags)
-      : ScheduleDAGInstrs(*C->MF, C->MLI, C->LIS, RemoveKillFlags),
-        AA(C->AA), SchedImpl(std::move(S)), Topo(SUnits, &ExitSU), CurrentTop(),
-        CurrentBottom(), NextClusterPred(nullptr), NextClusterSucc(nullptr) {
+      : ScheduleDAGInstrs(*C->MF, C->MLI, RemoveKillFlags), AA(C->AA),
+        LIS(C->LIS), SchedImpl(std::move(S)), Topo(SUnits, &ExitSU),
+        CurrentTop(), CurrentBottom(), NextClusterPred(nullptr),
+        NextClusterSucc(nullptr) {
 #ifndef NDEBUG
     NumInstrsScheduled = 0;
 #endif
@@ -266,6 +268,9 @@
   // Provide a vtable anchor
   ~ScheduleDAGMI() override;
 
+  // Returns LiveIntervals instance for use in DAG mutators and such.
+  LiveIntervals *getLIS() const { return LIS; }
+
   /// Return true if this DAG supports VReg liveness and RegPressure.
   virtual bool hasVRegLiveness() const { return false; }
 
Index: include/llvm/CodeGen/ScheduleDAGInstrs.h
===================================================================
--- include/llvm/CodeGen/ScheduleDAGInstrs.h
+++ include/llvm/CodeGen/ScheduleDAGInstrs.h
@@ -26,7 +26,6 @@
   class MachineFrameInfo;
   class MachineLoopInfo;
   class MachineDominatorTree;
-  class LiveIntervals;
   class RegPressureTracker;
   class PressureDiffs;
 
@@ -92,9 +91,6 @@
     const MachineLoopInfo *MLI;
     const MachineFrameInfo *MFI;
 
-    /// Live Intervals provides reaching defs in preRA scheduling.
-    LiveIntervals *LIS;
-
     /// TargetSchedModel provides an interface to the machine model.
     TargetSchedModel SchedModel;
 
@@ -172,14 +168,10 @@
   public:
     explicit ScheduleDAGInstrs(MachineFunction &mf,
                                const MachineLoopInfo *mli,
-                               LiveIntervals *LIS = nullptr,
                                bool RemoveKillFlags = false);
 
     ~ScheduleDAGInstrs() override {}
 
-    /// \brief Expose LiveIntervals for use in DAG mutators and such.
-    LiveIntervals *getLIS() const { return LIS; }
-
     /// \brief Get the machine model for instruction scheduling.
     const TargetSchedModel *getSchedModel() const { return &SchedModel; }
 
Index: lib/CodeGen/ScheduleDAGInstrs.cpp
===================================================================
--- lib/CodeGen/ScheduleDAGInstrs.cpp
+++ lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -51,9 +51,8 @@
 
 ScheduleDAGInstrs::ScheduleDAGInstrs(MachineFunction &mf,
                                      const MachineLoopInfo *mli,
-                                     LiveIntervals *LIS,
                                      bool RemoveKillFlags)
-    : ScheduleDAG(mf), MLI(mli), MFI(mf.getFrameInfo()), LIS(LIS),
+    : ScheduleDAG(mf), MLI(mli), MFI(mf.getFrameInfo()),
       RemoveKillFlags(RemoveKillFlags), CanHandleTerminators(false),
       TrackLaneMasks(false), FirstDbgValue(nullptr) {
   DbgValues.clear();