One Zone per CompilationInfo.

src/scopes.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 256 matching lines @@
 
   // Traverse the scope tree up to the first unresolved scope or the global
   // scope and start scope resolution and variable allocation from that scope.
   while (!top->is_global_scope() &&
          !top->outer_scope()->already_resolved()) {
     top = top->outer_scope();
   }
 
   // Allocate the variables.
   {
-    AstNodeFactory<AstNullVisitor> ast_node_factory(info->isolate());
+    AstNodeFactory<AstNullVisitor> ast_node_factory(info->isolate(),
+                                                    info->zone());
     if (!top->AllocateVariables(info, &ast_node_factory)) return false;
   }
 
 #ifdef DEBUG
   if (info->isolate()->bootstrapper()->IsActive()
           ? FLAG_print_builtin_scopes
           : FLAG_print_scopes) {
     scope->Print();
   }
 
@@ skipping 1004 matching lines @@
 }
 
 
 int Scope::ContextLocalCount() const {
   if (num_heap_slots() == 0) return 0;
   return num_heap_slots() - Context::MIN_CONTEXT_SLOTS -
       (function_ != NULL && function_->proxy()->var()->IsContextSlot() ? 1 : 0);
 }
 
 } }  // namespace v8::internal