diff --git a/llvm/lib/CodeGen/LiveDebugVariables.cpp b/llvm/lib/CodeGen/LiveDebugVariables.cpp
index 7d5646b..388f58f 100644
--- a/llvm/lib/CodeGen/LiveDebugVariables.cpp
+++ b/llvm/lib/CodeGen/LiveDebugVariables.cpp
@@ -329,13 +329,12 @@
   void computeIntervals();
 
 public:
-  LDVImpl(LiveDebugVariables *ps)
-      : pass(*ps), MF(nullptr), EmitDone(false), ModifiedMF(false) {}
+  LDVImpl(LiveDebugVariables *ps) : pass(*ps), EmitDone(false),
+                                    ModifiedMF(false) {}
   bool runOnMachineFunction(MachineFunction &mf);
 
   /// clear - Release all memory.
   void clear() {
-    MF = nullptr;
     userValues.clear();
     virtRegToEqClass.clear();
     userVarMap.clear();
@@ -694,11 +693,11 @@
 }
 
 bool LDVImpl::runOnMachineFunction(MachineFunction &mf) {
-  clear();
   MF = &mf;
   LIS = &pass.getAnalysis<LiveIntervals>();
   MDT = &pass.getAnalysis<MachineDominatorTree>();
   TRI = mf.getTarget().getRegisterInfo();
+  clear();
   LS.initialize(mf);
   DEBUG(dbgs() << "********** COMPUTING LIVE DEBUG VARIABLES: "
                << mf.getName() << " **********\n");
@@ -713,8 +712,6 @@
 bool LiveDebugVariables::runOnMachineFunction(MachineFunction &mf) {
   if (!EnableLDV)
     return false;
-  if (!FunctionDIs.count(mf.getFunction()))
-    return false;
   if (!pImpl)
     pImpl = new LDVImpl(this);
   return static_cast<LDVImpl*>(pImpl)->runOnMachineFunction(mf);
@@ -977,8 +974,6 @@
 
 void LDVImpl::emitDebugValues(VirtRegMap *VRM) {
   DEBUG(dbgs() << "********** EMITTING LIVE DEBUG VARIABLES **********\n");
-  if (!MF)
-    return;
   const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
   for (unsigned i = 0, e = userValues.size(); i != e; ++i) {
     DEBUG(userValues[i]->print(dbgs(), &MF->getTarget()));
@@ -993,10 +988,6 @@
     static_cast<LDVImpl*>(pImpl)->emitDebugValues(VRM);
 }
 
-bool LiveDebugVariables::doInitialization(Module &M) {
-  FunctionDIs = makeSubprogramMap(M);
-  return Pass::doInitialization(M);
-}
 
 #ifndef NDEBUG
 void LiveDebugVariables::dump() {