Add explicit keywords.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53179 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PIC16/PIC16ISelDAGToDAG.cpp b/lib/Target/PIC16/PIC16ISelDAGToDAG.cpp
index 325e71e..402566f 100644
--- a/lib/Target/PIC16/PIC16ISelDAGToDAG.cpp
+++ b/lib/Target/PIC16/PIC16ISelDAGToDAG.cpp
@@ -57,7 +57,7 @@
   PIC16TargetLowering PIC16Lowering;
 
 public:
-  PIC16DAGToDAGISel(PIC16TargetMachine &tm) : 
+  explicit PIC16DAGToDAGISel(PIC16TargetMachine &tm) : 
         SelectionDAGISel(PIC16Lowering),
         TM(tm), PIC16Lowering(*TM.getTargetLowering()) {}