From 9c0aa853377eaa36c0521b5cb29e52fbb7a0dda0 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Wed, 9 Sep 2009 17:07:07 +0000
Subject: [PATCH] Gracefully destroy MDNodes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81353 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/VMCore/LLVMContextImpl.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/VMCore/LLVMContextImpl.h b/lib/VMCore/LLVMContextImpl.h
index 77130d1ab94..048018d6b4d 100644
--- a/lib/VMCore/LLVMContextImpl.h
+++ b/lib/VMCore/LLVMContextImpl.h
@@ -203,6 +203,9 @@ public:
     AggZeroConstants.freeConstants();
     NullPtrConstants.freeConstants();
     UndefValueConstants.freeConstants();
+    for (FoldingSet<MDNode>::iterator I=MDNodeSet.begin(), 
+           E =MDNodeSet.end(); I != E; ++I)
+      I->dropAllReferences();
     for (IntMapTy::iterator I=IntConstants.begin(), E=IntConstants.end(); 
          I != E; ++I) {
       if (I->second->use_empty())