VM: Make ZoneAllocated-objects that don't need a vtable smaller.

runtime/vm/flow_graph_compiler.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_FLOW_GRAPH_COMPILER_H_
 #define VM_FLOW_GRAPH_COMPILER_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/code_descriptors.h"
@@ skipping 100 matching lines @@
  public:
   CompilerDeoptInfo(intptr_t deopt_id,
                     ICData::DeoptReasonId reason,
                     Environment* deopt_env)
       : pc_offset_(-1),
         deopt_id_(deopt_id),
         reason_(reason),
         deopt_env_(deopt_env) {
     ASSERT(deopt_env != NULL);
   }
+  virtual ~CompilerDeoptInfo() { }
 
   RawDeoptInfo* CreateDeoptInfo(FlowGraphCompiler* compiler,
                                 DeoptInfoBuilder* builder,
                                 const Array& deopt_table);
 
 
   // No code needs to be generated.
   virtual void GenerateCode(FlowGraphCompiler* compiler, intptr_t stub_ix) {}
 
   intptr_t pc_offset() const { return pc_offset_; }
@@ skipping 35 matching lines @@
  private:
   Label entry_label_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilerDeoptInfoWithStub);
 };
 
 
 class SlowPathCode : public ZoneAllocated {
  public:
   SlowPathCode() : entry_label_(), exit_label_() { }
+  virtual ~SlowPathCode() { }
 
   Label* entry_label() { return &entry_label_; }
   Label* exit_label() { return &exit_label_; }
 
   virtual void EmitNativeCode(FlowGraphCompiler* compiler) = 0;
 
  private:
   Label entry_label_;
   Label exit_label_;
 
@@ skipping 411 matching lines @@
   intptr_t entry_patch_pc_offset_;
   intptr_t patch_code_pc_offset_;
   intptr_t lazy_deopt_pc_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_COMPILER_H_