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/CellSPU/SPUISelDAGToDAG.cpp b/lib/Target/CellSPU/SPUISelDAGToDAG.cpp
index 6bc69ee..a672b13 100644
--- a/lib/Target/CellSPU/SPUISelDAGToDAG.cpp
+++ b/lib/Target/CellSPU/SPUISelDAGToDAG.cpp
@@ -227,7 +227,7 @@
   unsigned GlobalBaseReg;
 
 public:
-  SPUDAGToDAGISel(SPUTargetMachine &tm) :
+  explicit SPUDAGToDAGISel(SPUTargetMachine &tm) :
     SelectionDAGISel(*tm.getTargetLowering()),
     TM(tm),
     SPUtli(*tm.getTargetLowering())