diff --git a/include/llvm/CodeGen/MachineModuleInfo.h b/include/llvm/CodeGen/MachineModuleInfo.h
index 0cd24abde69..28f45441371 100644
--- a/include/llvm/CodeGen/MachineModuleInfo.h
+++ b/include/llvm/CodeGen/MachineModuleInfo.h
@@ -168,10 +168,13 @@ class MachineModuleInfo : public ImmutablePass {
 public:
   static char ID; // Pass identification, replacement for typeid
 
-  typedef std::pair<unsigned, DebugLoc> UnsignedDebugLocPair;
-  typedef SmallVector<std::pair<TrackingVH<MDNode>, UnsignedDebugLocPair>, 4>
-    VariableDbgInfoMapTy;
-  VariableDbgInfoMapTy VariableDbgInfo;
+  struct VariableDbgInfo {
+    TrackingVH<MDNode> Var;
+    unsigned Slot;
+    DebugLoc Loc;
+  };
+  typedef SmallVector<VariableDbgInfo, 4> VariableDbgInfoMapTy;
+  VariableDbgInfoMapTy VariableDbgInfos;
 
   MachineModuleInfo();  // DUMMY CONSTRUCTOR, DO NOT CALL.
   // Real constructor.
@@ -401,10 +404,11 @@ public:
   /// setVariableDbgInfo - Collect information used to emit debugging
   /// information of a variable.
   void setVariableDbgInfo(MDNode *N, unsigned Slot, DebugLoc Loc) {
-    VariableDbgInfo.push_back(std::make_pair(N, std::make_pair(Slot, Loc)));
+    VariableDbgInfo Info = { N, Slot, Loc };
+    VariableDbgInfos.push_back(std::move(Info));
   }
 
-  VariableDbgInfoMapTy &getVariableDbgInfo() { return VariableDbgInfo; }
+  VariableDbgInfoMapTy &getVariableDbgInfo() { return VariableDbgInfos; }
 
 }; // End class MachineModuleInfo
 
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index a1fea4f9750..5c17417c51e 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1185,26 +1185,23 @@ bool DwarfDebug::addCurrentFnArgument(DbgVariable *Var, LexicalScope *Scope) {
 void DwarfDebug::collectVariableInfoFromMMITable(
     SmallPtrSet<const MDNode *, 16> &Processed) {
   for (const auto &VI : MMI->getVariableDbgInfo()) {
-    const MDNode *Var = VI.first;
-    if (!Var)
+    if (!VI.Var)
       continue;
-    Processed.insert(Var);
-    DIVariable DV(Var);
-    const std::pair<unsigned, DebugLoc> &VP = VI.second;
-
-    LexicalScope *Scope = LScopes.findLexicalScope(VP.second);
+    Processed.insert(VI.Var);
+    DIVariable DV(VI.Var);
+    LexicalScope *Scope = LScopes.findLexicalScope(VI.Loc);
 
     // If variable scope is not found then skip this variable.
     if (Scope == 0)
       continue;
 
-    DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.second);
+    DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VI.Loc);
     DbgVariable *RegVar = new DbgVariable(DV, AbsDbgVariable, this);
-    RegVar->setFrameIndex(VP.first);
+    RegVar->setFrameIndex(VI.Slot);
     if (!addCurrentFnArgument(RegVar, Scope))
       addScopeVariable(Scope, RegVar);
     if (AbsDbgVariable)
-      AbsDbgVariable->setFrameIndex(VP.first);
+      AbsDbgVariable->setFrameIndex(VI.Slot);
   }
 }
 
diff --git a/lib/CodeGen/MachineModuleInfo.cpp b/lib/CodeGen/MachineModuleInfo.cpp
index d0ff1e70699..71810255845 100644
--- a/lib/CodeGen/MachineModuleInfo.cpp
+++ b/lib/CodeGen/MachineModuleInfo.cpp
@@ -313,7 +313,7 @@ void MachineModuleInfo::EndFunction() {
   CallsEHReturn = 0;
   CallsUnwindInit = 0;
   CompactUnwindEncoding = 0;
-  VariableDbgInfo.clear();
+  VariableDbgInfos.clear();
 }
 
 /// AnalyzeModule - Scan the module for global debug information.
diff --git a/lib/CodeGen/StackColoring.cpp b/lib/CodeGen/StackColoring.cpp
index 6ef0ab8a0cd..a1f7a126754 100644
--- a/lib/CodeGen/StackColoring.cpp
+++ b/lib/CodeGen/StackColoring.cpp
@@ -473,15 +473,12 @@ void StackColoring::remapInstructions(DenseMap<int, int> &SlotRemap) {
   MachineModuleInfo *MMI = &MF->getMMI();
 
   // Remap debug information that refers to stack slots.
-  MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
-  for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
-       VE = VMap.end(); VI != VE; ++VI) {
-    const MDNode *Var = VI->first;
-    if (!Var) continue;
-    std::pair<unsigned, DebugLoc> &VP = VI->second;
-    if (SlotRemap.count(VP.first)) {
-      DEBUG(dbgs()<<"Remapping debug info for ["<<Var->getName()<<"].\n");
-      VP.first = SlotRemap[VP.first];
+  for (auto &VI : MMI->getVariableDbgInfo()) {
+    if (!VI.Var)
+      continue;
+    if (SlotRemap.count(VI.Slot)) {
+      DEBUG(dbgs()<<"Remapping debug info for ["<<VI.Var->getName()<<"].\n");
+      VI.Slot = SlotRemap[VI.Slot];
       FixedDbg++;
     }
   }