diff --git a/llvm/lib/CodeGen/LiveInterval.cpp b/llvm/lib/CodeGen/LiveInterval.cpp
index 4d38f0adcfa2..9b4872d83084 100644
--- a/llvm/lib/CodeGen/LiveInterval.cpp
+++ b/llvm/lib/CodeGen/LiveInterval.cpp
@@ -476,7 +476,9 @@ void LiveInterval::MergeValueNumberInto(VNInfo *V1, VNInfo *V2) {
   // ~1U so it can be nuked later.
   if (V1->id == getNumValNums()-1) {
     do {
+      VNInfo *VNI = valnos.back();
       valnos.pop_back();
+      VNI->~VNInfo();
     } while (valnos.back()->def == ~1U);
   } else {
     V1->def = ~1U;
diff --git a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
index 2f93b7694854..3d324b7bfc66 100644
--- a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -62,10 +62,11 @@ void LiveIntervals::getAnalysisUsage(AnalysisUsage &AU) const {
 }
 
 void LiveIntervals::releaseMemory() {
-  VNInfoAllocator.Reset();
   mi2iMap_.clear();
   i2miMap_.clear();
   r2iMap_.clear();
+  // Release VNInfo memroy regions after all VNInfo objects are dtor'd.
+  VNInfoAllocator.Reset();
   for (unsigned i = 0, e = ClonedMIs.size(); i != e; ++i)
     delete ClonedMIs[i];
 }