Silence warning from presubmit lint script

R=yangguo@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9234025

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10496 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-instructions.h

@@ -764,6 +764,7 @@ class HValue: public ZoneObject {
   int flags_;
   GVNFlagSet gvn_flags_;
 
+ private:
   DISALLOW_COPY_AND_ASSIGN(HValue);
 };