Index: llvm/lib/IR/Constants.cpp
===================================================================
--- llvm/lib/IR/Constants.cpp
+++ llvm/lib/IR/Constants.cpp
@@ -545,14 +545,14 @@
 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
   // get an existing value or the insertion position
   LLVMContextImpl *pImpl = Context.pImpl;
-  ConstantInt *&Slot = pImpl->IntConstants[V];
+  std::unique_ptr<ConstantInt> &Slot = pImpl->IntConstants[V];
   if (!Slot) {
     // Get the corresponding integer type for the bit width of the value.
     IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
-    Slot = new ConstantInt(ITy, V);
+    Slot.reset(new ConstantInt(ITy, V));
   }
   assert(Slot->getType() == IntegerType::get(Context, V.getBitWidth()));
-  return Slot;
+  return Slot.get();
 }
 
 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
@@ -685,7 +685,7 @@
 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
   LLVMContextImpl* pImpl = Context.pImpl;
 
-  ConstantFP *&Slot = pImpl->FPConstants[V];
+  std::unique_ptr<ConstantFP> &Slot = pImpl->FPConstants[V];
 
   if (!Slot) {
     Type *Ty;
@@ -704,10 +704,10 @@
              "Unknown FP format");
       Ty = Type::getPPC_FP128Ty(Context);
     }
-    Slot = new ConstantFP(Ty, V);
+    Slot.reset(new ConstantFP(Ty, V));
   }
 
-  return Slot;
+  return Slot.get();
 }
 
 Constant *ConstantFP::getInfinity(Type *Ty, bool Negative) {
@@ -1259,12 +1259,13 @@
 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
   assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
          "Cannot create an aggregate zero of non-aggregate type!");
-  
-  ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
-  if (!Entry)
-    Entry = new ConstantAggregateZero(Ty);
 
-  return Entry;
+  std::unique_ptr<ConstantAggregateZero> &Entry =
+      Ty->getContext().pImpl->CAZConstants[Ty];
+  if (!Entry)
+    Entry.reset(new ConstantAggregateZero(Ty));
+
+  return Entry.get();
 }
 
 /// Remove the constant from the constant table.
@@ -1325,11 +1326,12 @@
 //
 
 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
-  ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
+  std::unique_ptr<ConstantPointerNull> &Entry =
+      Ty->getContext().pImpl->CPNConstants[Ty];
   if (!Entry)
-    Entry = new ConstantPointerNull(Ty);
+    Entry.reset(new ConstantPointerNull(Ty));
 
-  return Entry;
+  return Entry.get();
 }
 
 /// Remove the constant from the constant table.
@@ -1338,11 +1340,11 @@
 }
 
 UndefValue *UndefValue::get(Type *Ty) {
-  UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
+  std::unique_ptr<UndefValue> &Entry = Ty->getContext().pImpl->UVConstants[Ty];
   if (!Entry)
-    Entry = new UndefValue(Ty);
+    Entry.reset(new UndefValue(Ty));
 
-  return Entry;
+  return Entry.get();
 }
 
 /// Remove the constant from the constant table.
Index: llvm/lib/IR/LLVMContextImpl.h
===================================================================
--- llvm/lib/IR/LLVMContextImpl.h
+++ llvm/lib/IR/LLVMContextImpl.h
@@ -1049,10 +1049,12 @@
   LLVMContext::YieldCallbackTy YieldCallback;
   void *YieldOpaqueHandle;
 
-  typedef DenseMap<APInt, ConstantInt *, DenseMapAPIntKeyInfo> IntMapTy;
+  typedef DenseMap<APInt, std::unique_ptr<ConstantInt>, DenseMapAPIntKeyInfo>
+      IntMapTy;
   IntMapTy IntConstants;
 
-  typedef DenseMap<APFloat, ConstantFP *, DenseMapAPFloatKeyInfo> FPMapTy;
+  typedef DenseMap<APFloat, std::unique_ptr<ConstantFP>, DenseMapAPFloatKeyInfo>
+      FPMapTy;
   FPMapTy FPConstants;
 
   FoldingSet<AttributeImpl> AttrsSet;
@@ -1078,7 +1080,7 @@
   // them on context teardown.
   std::vector<MDNode *> DistinctMDNodes;
 
-  DenseMap<Type*, ConstantAggregateZero*> CAZConstants;
+  DenseMap<Type *, std::unique_ptr<ConstantAggregateZero>> CAZConstants;
 
   typedef ConstantUniqueMap<ConstantArray> ArrayConstantsTy;
   ArrayConstantsTy ArrayConstants;
@@ -1088,11 +1090,11 @@
   
   typedef ConstantUniqueMap<ConstantVector> VectorConstantsTy;
   VectorConstantsTy VectorConstants;
-  
-  DenseMap<PointerType*, ConstantPointerNull*> CPNConstants;
 
-  DenseMap<Type*, UndefValue*> UVConstants;
-  
+  DenseMap<PointerType *, std::unique_ptr<ConstantPointerNull>> CPNConstants;
+
+  DenseMap<Type *, std::unique_ptr<UndefValue>> UVConstants;
+
   StringMap<ConstantDataSequential*> CDSConstants;
 
   DenseMap<std::pair<const Function *, const BasicBlock *>, BlockAddress *>
Index: llvm/lib/IR/LLVMContextImpl.cpp
===================================================================
--- llvm/lib/IR/LLVMContextImpl.cpp
+++ llvm/lib/IR/LLVMContextImpl.cpp
@@ -94,12 +94,13 @@
   ArrayConstants.freeConstants();
   StructConstants.freeConstants();
   VectorConstants.freeConstants();
-  DeleteContainerSeconds(CAZConstants);
-  DeleteContainerSeconds(CPNConstants);
-  DeleteContainerSeconds(UVConstants);
   InlineAsms.freeConstants();
-  DeleteContainerSeconds(IntConstants);
-  DeleteContainerSeconds(FPConstants);
+
+  CAZConstants.clear();
+  CPNConstants.clear();
+  UVConstants.clear();
+  IntConstants.clear();
+  FPConstants.clear();
 
   for (auto &CDSConstant : CDSConstants)
     delete CDSConstant.second;