From 90f8795e1c0d43e5b3d6254ff2a3cad533069218 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 27 Jul 2010 18:59:50 +0000
Subject: [PATCH] make lookup failures not fatal.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109530 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/ADT/ScopedHashTable.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/llvm/ADT/ScopedHashTable.h b/include/llvm/ADT/ScopedHashTable.h
index b5ca374a7dd..c96ad19707f 100644
--- a/include/llvm/ADT/ScopedHashTable.h
+++ b/include/llvm/ADT/ScopedHashTable.h
@@ -139,7 +139,12 @@ public:
   }
 
   V lookup(const K &Key) {
-    return TopLevelMap[Key]->getValue();
+    typename DenseMap<K, ScopedHashTableVal<K, V, KInfo>*, KInfo>::iterator
+      I = TopLevelMap.find(Key);
+    if (I != TopLevelMap.end())
+      return I->second->getValue();
+      
+    return V();
   }
 
   void insert(const K &Key, const V &Val) {