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/CellSPU/SPUInstrInfo.h b/lib/Target/CellSPU/SPUInstrInfo.h
index c5fe811..dc49202 100644
--- a/lib/Target/CellSPU/SPUInstrInfo.h
+++ b/lib/Target/CellSPU/SPUInstrInfo.h
@@ -24,7 +24,7 @@
     SPUTargetMachine &TM;
     const SPURegisterInfo RI;
   public:
-    SPUInstrInfo(SPUTargetMachine &tm);
+    explicit SPUInstrInfo(SPUTargetMachine &tm);
 
     /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info.  As
     /// such, whenever a client has an instance of instruction info, it should