Put all LLVM code into the llvm namespace, as per bug 109.

llvm-svn: 9903
diff --git a/llvm/lib/Transforms/Utils/ValueMapper.h b/llvm/lib/Transforms/Utils/ValueMapper.h
index 8264ade..e67b326 100644
--- a/llvm/lib/Transforms/Utils/ValueMapper.h
+++ b/llvm/lib/Transforms/Utils/ValueMapper.h
@@ -16,8 +16,13 @@
 #define LIB_TRANSFORMS_UTILS_VALUE_MAPPER_H
 
 #include <map>
+
+namespace llvm {
+
 class Value;
 
 Value *MapValue(const Value *V, std::map<const Value*, Value*> &VM);
 
+} // End llvm namespace
+
 #endif