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/IA64/IA64MachineFunctionInfo.h b/lib/Target/IA64/IA64MachineFunctionInfo.h
index fb93056..e6254d6 100644
--- a/lib/Target/IA64/IA64MachineFunctionInfo.h
+++ b/lib/Target/IA64/IA64MachineFunctionInfo.h
@@ -24,7 +24,7 @@
   // by this machinefunction? (used to compute the appropriate
   // entry in the 'alloc' instruction at the top of the
   // machinefunction)
-  IA64FunctionInfo(MachineFunction& MF) { outRegsUsed=0; };
+  explicit IA64FunctionInfo(MachineFunction& MF) { outRegsUsed=0; };
 
 };