diff --git a/llvm/include/llvm/Metadata.h b/llvm/include/llvm/Metadata.h
index 63b9e5ae83b18c1448ca0a62be3a3131652e48ff..d16b7dc323ee1e2c58131005cdb45776e57954d1 100644
--- a/llvm/include/llvm/Metadata.h
+++ b/llvm/include/llvm/Metadata.h
@@ -254,7 +254,7 @@ public:
   MDNode *getMD(unsigned Kind, const Instruction *Inst);
 
   /// getMDs - Get the metadata attached to an Instruction.
-  const MDMapTy *getMDs(const Instruction *Inst);
+  void getMDs(const Instruction *Inst, SmallVectorImpl<MDPairTy> &MDs) const;
 
   /// addMD - Attach the metadata of given kind to an Instruction.
   void addMD(unsigned Kind, MDNode *Node, Instruction *Inst);
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index c8cb59527d3efba2bfd5e311a741f2ee192f5db2..037854e26fa46c45d795551b9861c3d0702baa3e 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -561,14 +561,16 @@ static void WriteMetadataAttachment(const Function &F,
   // Write metadata attachments
   // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
   MetadataContext &TheMetadata = F.getContext().getMetadata();
+  typedef SmallVector<std::pair<unsigned, TrackingVH<MDNode> >, 2> MDMapTy;
+  MDMapTy MDs;
   for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
     for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
          I != E; ++I) {
-      const MetadataContext::MDMapTy *P = TheMetadata.getMDs(I);
-      if (!P) continue;
+      MDs.clear();
+      TheMetadata.getMDs(I, MDs);
       bool RecordedInstruction = false;
-      for (MetadataContext::MDMapTy::const_iterator PI = P->begin(), 
-             PE = P->end(); PI != PE; ++PI) {
+      for (MDMapTy::const_iterator PI = MDs.begin(), PE = MDs.end();
+             PI != PE; ++PI) {
         if (RecordedInstruction == false) {
           Record.push_back(VE.getInstructionID(I));
           RecordedInstruction = true;
diff --git a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
index 4257281a3aa1265adc9a98058c9f696e64c661d2..85aa5fa23bcddc6a0d93be44cb99e51640097561 100644
--- a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
+++ b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
@@ -87,6 +87,8 @@ ValueEnumerator::ValueEnumerator(const Module *M) {
       EnumerateType(I->getType());
 
     MetadataContext &TheMetadata = F->getContext().getMetadata();
+    typedef SmallVector<std::pair<unsigned, TrackingVH<MDNode> >, 2> MDMapTy;
+    MDMapTy MDs;
     for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
       for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E;++I){
         for (User::const_op_iterator OI = I->op_begin(), E = I->op_end();
@@ -99,11 +101,11 @@ ValueEnumerator::ValueEnumerator(const Module *M) {
           EnumerateAttributes(II->getAttributes());
 
         // Enumerate metadata attached with this instruction.
-        const MetadataContext::MDMapTy *MDs = TheMetadata.getMDs(I);
-        if (MDs)
-          for (MetadataContext::MDMapTy::const_iterator MI = MDs->begin(),
-                 ME = MDs->end(); MI != ME; ++MI)
-            EnumerateMetadata(MI->second);
+        MDs.clear();
+        TheMetadata.getMDs(I, MDs);
+        for (MDMapTy::const_iterator MI = MDs.begin(), ME = MDs.end(); MI != ME;
+             ++MI)
+          EnumerateMetadata(MI->second);
       }
   }
 
diff --git a/llvm/lib/VMCore/AsmWriter.cpp b/llvm/lib/VMCore/AsmWriter.cpp
index fb1b1ac41c26e6d98355d77d201a68f733ebf43b..d8a708dbbcc565c2634ff1dd2a8c5331b501ee6a 100644
--- a/llvm/lib/VMCore/AsmWriter.cpp
+++ b/llvm/lib/VMCore/AsmWriter.cpp
@@ -680,6 +680,8 @@ void SlotTracker::processFunction() {
   ST_DEBUG("Inserting Instructions:\n");
 
   MetadataContext &TheMetadata = TheFunction->getContext().getMetadata();
+  typedef SmallVector<std::pair<unsigned, TrackingVH<MDNode> >, 2> MDMapTy;
+  MDMapTy MDs;
 
   // Add all of the basic blocks and instructions with no names.
   for (Function::const_iterator BB = TheFunction->begin(),
@@ -696,11 +698,11 @@ void SlotTracker::processFunction() {
           CreateMetadataSlot(N);
 
       // Process metadata attached with this instruction.
-      const MetadataContext::MDMapTy *MDs = TheMetadata.getMDs(I);
-      if (MDs)
-        for (MetadataContext::MDMapTy::const_iterator MI = MDs->begin(),
-               ME = MDs->end(); MI != ME; ++MI)
-          CreateMetadataSlot(MI->second);
+      MDs.clear();
+      TheMetadata.getMDs(I, MDs);
+      for (MDMapTy::const_iterator MI = MDs.begin(), ME = MDs.end(); MI != ME; 
+           ++MI)
+        CreateMetadataSlot(MI->second);
     }
   }
 
@@ -2034,12 +2036,13 @@ void AssemblyWriter::printInstruction(const Instruction &I) {
   // Print Metadata info
   if (!MDNames.empty()) {
     MetadataContext &TheMetadata = I.getContext().getMetadata();
-    const MetadataContext::MDMapTy *MDMap = TheMetadata.getMDs(&I);
-    if (MDMap)
-      for (MetadataContext::MDMapTy::const_iterator MI = MDMap->begin(),
-             ME = MDMap->end(); MI != ME; ++MI)
-        Out << ", !" << MDNames[MI->first]
-            << " !" << Machine.getMetadataSlot(MI->second);
+    typedef SmallVector<std::pair<unsigned, TrackingVH<MDNode> >, 2> MDMapTy;
+    MDMapTy MDs;
+    TheMetadata.getMDs(&I, MDs);
+    for (MDMapTy::const_iterator MI = MDs.begin(), ME = MDs.end(); MI != ME; 
+         ++MI)
+      Out << ", !" << MDNames[MI->first]
+          << " !" << Machine.getMetadataSlot(MI->second);
   }
   printInfoComment(I);
 }
diff --git a/llvm/lib/VMCore/Metadata.cpp b/llvm/lib/VMCore/Metadata.cpp
index f4d60714f997cde2071f5fd0f83e988122bdb57c..fdac408abecf235edf22b2befd170eccc240b26e 100644
--- a/llvm/lib/VMCore/Metadata.cpp
+++ b/llvm/lib/VMCore/Metadata.cpp
@@ -294,13 +294,15 @@ MDNode *MetadataContext::getMD(unsigned MDKind, const Instruction *Inst) {
 }
 
 /// getMDs - Get the metadata attached to an Instruction.
-const MetadataContext::MDMapTy *
-MetadataContext::getMDs(const Instruction *Inst) {
+void MetadataContext::
+getMDs(const Instruction *Inst, SmallVectorImpl<MDPairTy> &MDs) const {
   MDStoreTy::iterator I = MetadataStore.find(Inst);
   if (I == MetadataStore.end())
-    return NULL;
-  
-  return &I->second;
+    return;
+  for (MDMapTy::iterator MI = I->second.begin(), ME = I->second.end();
+       MI != ME; ++MI)
+    MDs.push_back(std::make_pair(MI->first, MI->second));
+  std::sort(MDs.begin(), MDs.end());
 }
 
 /// getHandlerNames - Populate client supplied smallvector using custome