Fix clang build; remove dead private field.

TBR=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/460683003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23040 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler/scheduler.cc

@@ -16,8 +16,7 @@ namespace internal {
 namespace compiler {
 
 Scheduler::Scheduler(Zone* zone, Graph* graph, Schedule* schedule)
-    : zone_(zone),
-      graph_(graph),
+    : graph_(graph),
       schedule_(schedule),
       branches_(NodeVector::allocator_type(zone)),
       calls_(NodeVector::allocator_type(zone)),

src/compiler/scheduler.h

@@ -29,7 +29,6 @@ class Scheduler {
   static BasicBlockVector* ComputeSpecialRPO(Schedule* schedule);
 
  private:
-  Zone* zone_;
   Graph* graph_;
   Schedule* schedule_;
   NodeVector branches_;