Add an explicit keyword.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100187 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/Support/SlowOperationInformer.h b/include/llvm/Support/SlowOperationInformer.h
index 524049c..607d993 100644
--- a/include/llvm/Support/SlowOperationInformer.h
+++ b/include/llvm/Support/SlowOperationInformer.h
@@ -41,7 +41,7 @@
     SlowOperationInformer(const SlowOperationInformer&);   // DO NOT IMPLEMENT
     void operator=(const SlowOperationInformer&);          // DO NOT IMPLEMENT
   public:
-    SlowOperationInformer(const std::string &Name);
+    explicit SlowOperationInformer(const std::string &Name);
     ~SlowOperationInformer();
 
     /// progress - Clients should periodically call this method when they can