Add explicit keywords.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72969 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/MSP430/MSP430MachineFunctionInfo.h b/lib/Target/MSP430/MSP430MachineFunctionInfo.h
index b94d7e4..1d26ae3 100644
--- a/lib/Target/MSP430/MSP430MachineFunctionInfo.h
+++ b/lib/Target/MSP430/MSP430MachineFunctionInfo.h
@@ -28,7 +28,8 @@
 public:
   MSP430MachineFunctionInfo() : CalleeSavedFrameSize(0) {}
 
-  MSP430MachineFunctionInfo(MachineFunction &MF) : CalleeSavedFrameSize(0) {}
+  explicit MSP430MachineFunctionInfo(MachineFunction &MF)
+    : CalleeSavedFrameSize(0) {}
 
   unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; }
   void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; }