Plug a minor memory leak


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13317 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/IPA/CallGraph.cpp b/lib/Analysis/IPA/CallGraph.cpp
index 8d660b9..74a28d8 100644
--- a/lib/Analysis/IPA/CallGraph.cpp
+++ b/lib/Analysis/IPA/CallGraph.cpp
@@ -125,6 +125,7 @@
        I != E; ++I)
     delete I->second;
   FunctionMap.clear();
+  delete CallsExternalNode;
 }
 
 static void WriteToOutput(const CallGraphNode *CGN, std::ostream &o) {