Cache initial (empty) ic_data arrays so that they are not repeatedly allocated. Factor out descript…

runtime/vm/snapshot_ids.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_SNAPSHOT_IDS_H_
 #define VM_SNAPSHOT_IDS_H_
 
 #include "vm/raw_object.h"
 #include "vm/dart_entry.h"
 
@@ skipping 36 matching lines @@
   kExtractorParameterNames,
   kEmptyContextScopeObject,
   kImplicitClosureScopeObject,
   kEmptyObjectPool,
   kEmptyDescriptors,
   kEmptyVarDescriptors,
   kEmptyExceptionHandlers,
   kCachedArgumentsDescriptor0,
   kCachedArgumentsDescriptorN = (kCachedArgumentsDescriptor0 +
       ArgumentsDescriptor::kCachedDescriptorCount - 1),
+  kCachedICDataArray0,
+  kCachedICDataArrayN = (kCachedICDataArray0 +
+      ICData::kCachedICDataArrayCount - 1),
 
   kInstanceObjectId,
   kStaticImplicitClosureObjectId,
   kMaxPredefinedObjectIds,
   kInvalidIndex = -1,
 };
 
 }  // namespace dart
 
 #endif  // VM_SNAPSHOT_IDS_H_