Save more memory by compacting LocalVarDescriptors

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 3073 matching lines @@
               RawLocalVarDescriptors::VarInfo* info) const;
 
   void GetInfo(intptr_t var_index, RawLocalVarDescriptors::VarInfo* info) const;
 
   static const intptr_t kBytesPerElement =
       sizeof(RawLocalVarDescriptors::VarInfo);
   static const intptr_t kMaxElements = RawLocalVarDescriptors::kMaxIndex;
 
   static intptr_t InstanceSize() {
     ASSERT(sizeof(RawLocalVarDescriptors) ==
-        OFFSET_OF_RETURNED_VALUE(RawLocalVarDescriptors, data));
+        OFFSET_OF_RETURNED_VALUE(RawLocalVarDescriptors, names));
     return 0;
   }
   static intptr_t InstanceSize(intptr_t len) {
     ASSERT(0 <= len && len <= kMaxElements);
-    return RoundedAllocationSize(
-        sizeof(RawLocalVarDescriptors) + (len * kBytesPerElement));
+    return RoundedAllocationSize(sizeof(RawLocalVarDescriptors)
+        + (len * kWordSize)  // RawStrings for names.
+        + (len * sizeof(RawLocalVarDescriptors::VarInfo)));
   }
 
   static RawLocalVarDescriptors* New(intptr_t num_variables);
 
   static const char* KindToStr(intptr_t kind);
 
  private:
   FINAL_HEAP_OBJECT_IMPLEMENTATION(LocalVarDescriptors, Object);
   friend class Class;
   friend class Object;
@@ skipping 4340 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_