Lazily generate local var descriptors.

runtime/vm/object.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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 4022 matching lines @@
   void DumpInlinedIntervals() const;
 
   RawLocalVarDescriptors* var_descriptors() const {
     return raw_ptr()->var_descriptors_;
   }
   void set_var_descriptors(const LocalVarDescriptors& value) const {
     ASSERT(value.IsOld());
     StorePointer(&raw_ptr()->var_descriptors_, value.raw());
   }
 
+  // Will compute local var descriptors is necessary.
+  RawLocalVarDescriptors* GetLocalVarDescriptors() const;
+
   RawExceptionHandlers* exception_handlers() const {
     return raw_ptr()->exception_handlers_;
   }
   void set_exception_handlers(const ExceptionHandlers& handlers) const {
     ASSERT(handlers.IsOld());
     StorePointer(&raw_ptr()->exception_handlers_, handlers.raw());
   }
 
   // TODO(turnidge): Consider dropping this function and making
   // everybody use owner().  Currently this function is misused - even
@@ skipping 3716 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_