Small const-correctness fix


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50723 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvmc2/Action.h b/tools/llvmc2/Action.h
index 43495c4..3f7b33b 100644
--- a/tools/llvmc2/Action.h
+++ b/tools/llvmc2/Action.h
@@ -28,7 +28,7 @@
       : Command_(C), Args_(A)
     {}
 
-    int Execute();
+    int Execute() const;
   };
 
 }