diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp
index 31e6ea8..9a9f5b9 100644
--- a/lib/CodeGen/MachineBasicBlock.cpp
+++ b/lib/CodeGen/MachineBasicBlock.cpp
@@ -18,6 +18,7 @@
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetInstrDesc.h"
 #include "llvm/Target/TargetMachine.h"
+#include "llvm/Support/LeakDetector.h"
 #include <algorithm>
 using namespace llvm;
 
@@ -26,6 +27,10 @@
   Insts.getTraits().Parent = this;
 }
 
+MachineBasicBlock::~MachineBasicBlock() {
+  LeakDetector::removeGarbageObject(this);
+}
+
 std::ostream& llvm::operator<<(std::ostream &OS, const MachineBasicBlock &MBB) {
   MBB.print(OS);
   return OS;
@@ -46,11 +51,14 @@
   MachineRegisterInfo &RegInfo = MF.getRegInfo();
   for (MachineBasicBlock::iterator I = N->begin(), E = N->end(); I != E; ++I)
     I->AddRegOperandsToUseLists(RegInfo);
+
+  LeakDetector::removeGarbageObject(N);
 }
 
 void alist_traits<MachineBasicBlock>::removeNodeFromList(MachineBasicBlock* N) {
   N->getParent()->removeFromMBBNumbering(N->Number);
   N->Number = -1;
+  LeakDetector::addGarbageObject(N);
 }
 
 
@@ -65,6 +73,8 @@
   // use/def lists.
   MachineFunction *MF = Parent->getParent();
   N->AddRegOperandsToUseLists(MF->getRegInfo());
+
+  LeakDetector::removeGarbageObject(N);
 }
 
 /// removeNodeFromList (MI) - When we remove an instruction from a basic block
@@ -77,6 +87,8 @@
   N->RemoveRegOperandsFromUseLists();
   
   N->setParent(0);
+
+  LeakDetector::addGarbageObject(N);
 }
 
 /// transferNodesFromList (MI) - When moving a range of instructions from one