Add explicit keywords, and fix a minor typo that they uncovered.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45034 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CollectorMetadata.cpp b/lib/CodeGen/CollectorMetadata.cpp
index 5734939..43f3d43 100644
--- a/lib/CodeGen/CollectorMetadata.cpp
+++ b/lib/CodeGen/CollectorMetadata.cpp
@@ -30,7 +30,7 @@
     std::ostream &OS;
     
   public:
-    Printer(std::ostream &OS = *cerr);
+    explicit Printer(std::ostream &OS = *cerr);
     
     const char *getPassName() const;
     void getAnalysisUsage(AnalysisUsage &AU) const;