diff --git a/include/llvm/Support/Allocator.h b/include/llvm/Support/Allocator.h
index b1f59dc05e7..a58b9db27fa 100644
--- a/include/llvm/Support/Allocator.h
+++ b/include/llvm/Support/Allocator.h
@@ -134,6 +134,7 @@ class BumpPtrAllocator {
   static MallocSlabAllocator DefaultSlabAllocator;
 
 public:
+  typedef void (*DTorFunction)(void*);
   BumpPtrAllocator(size_t size = 4096, size_t threshold = 4096,
                    SlabAllocator &allocator = DefaultSlabAllocator);
   ~BumpPtrAllocator();
@@ -142,6 +143,11 @@ public:
   /// to the beginning of it, freeing all memory allocated so far.
   void Reset();
 
+  /// Reset - like Reset(), but call DTorFunction for each allocated
+  /// object. This assumes that all objects allocated with this allocator
+  /// had the same size and alignment specified here.
+  void Reset(size_t Size, size_t Alignment, DTorFunction DTor);
+
   /// Allocate - Allocate space at the specified alignment.
   ///
   void *Allocate(size_t Size, size_t Alignment);
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index e657c46c721..53366b9f074 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -82,6 +82,11 @@ void LiveIntervals::getAnalysisUsage(AnalysisUsage &AU) const {
   MachineFunctionPass::getAnalysisUsage(AU);
 }
 
+static void VNInfoDTor(void* Ptr)
+{
+   reinterpret_cast<VNInfo*>(Ptr)->~VNInfo();
+}
+
 void LiveIntervals::releaseMemory() {
   // Free the live intervals themselves.
   for (DenseMap<unsigned, LiveInterval*>::iterator I = r2iMap_.begin(),
@@ -91,7 +96,7 @@ void LiveIntervals::releaseMemory() {
   r2iMap_.clear();
 
   // Release VNInfo memroy regions after all VNInfo objects are dtor'd.
-  VNInfoAllocator.Reset();
+  VNInfoAllocator.Reset((unsigned)sizeof(VNInfo), alignof<VNInfo>(), VNInfoDTor);
   while (!CloneMIs.empty()) {
     MachineInstr *MI = CloneMIs.back();
     CloneMIs.pop_back();
diff --git a/lib/Support/Allocator.cpp b/lib/Support/Allocator.cpp
index 31b45c8d4aa..7433247c237 100644
--- a/lib/Support/Allocator.cpp
+++ b/lib/Support/Allocator.cpp
@@ -78,6 +78,21 @@ void BumpPtrAllocator::Reset() {
   End = ((char*)CurSlab) + CurSlab->Size;
 }
 
+void BumpPtrAllocator::Reset(size_t Size, size_t Alignment, DTorFunction DTor) {
+  if (Alignment == 0) Alignment = 1;
+  MemSlab *Slab = CurSlab;
+  while (Slab) {
+    char *End = Slab == CurSlab ? CurPtr : (char*)Slab + Slab->Size;
+    for (char *Ptr = (char*)Slab+1; Ptr < End; Ptr += Size) {
+	Ptr = AlignPtr(Ptr, Alignment);
+	if (Ptr + Size <= End)
+	    DTor(Ptr);
+    }
+    Slab = Slab->NextPtr;
+  }
+  Reset();
+}
+
 /// Allocate - Allocate space at the specified alignment.
 ///
 void *BumpPtrAllocator::Allocate(size_t Size, size_t Alignment) {