Fix a memory leak.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41739 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp
index 4d38f0a..9b4872d 100644
--- a/lib/CodeGen/LiveInterval.cpp
+++ b/lib/CodeGen/LiveInterval.cpp
@@ -476,7 +476,9 @@
   // ~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;