Add explicit keywords.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48801 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Alpha/AlphaJITInfo.h b/lib/Target/Alpha/AlphaJITInfo.h
index a12f546..2951169 100644
--- a/lib/Target/Alpha/AlphaJITInfo.h
+++ b/lib/Target/Alpha/AlphaJITInfo.h
@@ -26,7 +26,7 @@
   protected:
     TargetMachine &TM;
   public:
-    AlphaJITInfo(TargetMachine &tm) : TM(tm)
+    explicit AlphaJITInfo(TargetMachine &tm) : TM(tm)
     { useGOT = true; }
 
     virtual void *emitFunctionStub(void *Fn, MachineCodeEmitter &MCE);