Fix comment.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150859 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGDecl.cpp

@@ -1521,7 +1521,7 @@ void CodeGenFunction::EmitParmDecl(const VarDecl &D, llvm::Value *Arg,
 
         if (lt == Qualifiers::OCL_Weak) {
           EmitARCInitWeak(DeclPtr, Arg);
-          doStore = false; // The weak init is a store, no need to do two
+          doStore = false; // The weak init is a store, no need to do two.
         }
       }