Add explicit keywords.

llvm-svn: 64915
diff --git a/llvm/lib/Target/Sparc/FPMover.cpp b/llvm/lib/Target/Sparc/FPMover.cpp
index 5faf2a1..f72a4c4 100644
--- a/llvm/lib/Target/Sparc/FPMover.cpp
+++ b/llvm/lib/Target/Sparc/FPMover.cpp
@@ -33,7 +33,7 @@
     TargetMachine &TM;
     
     static char ID;
-    FPMover(TargetMachine &tm) 
+    explicit FPMover(TargetMachine &tm) 
       : MachineFunctionPass(&ID), TM(tm) { }
 
     virtual const char *getPassName() const {