Introduce a SignatureData class so that signature functions can store both their

runtime/vm/symbols.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 RUNTIME_VM_SYMBOLS_H_
 #define RUNTIME_VM_SYMBOLS_H_
 
 #include "vm/growable_array.h"
 #include "vm/object.h"
 #include "vm/snapshot_ids.h"
@@ skipping 138 matching lines @@
   V(BoundedType, "_BoundedType")                                               \
   V(MixinAppType, "_MixinAppType")                                             \
   V(TypeArguments, "TypeArguments")                                            \
   V(Patch, "patch")                                                            \
   V(PatchClass, "PatchClass")                                                  \
   V(Function, "Function")                                                      \
   V(_Closure, "_Closure")                                                      \
   V(FunctionResult, "function result")                                         \
   V(FactoryResult, "factory result")                                           \
   V(ClosureData, "ClosureData")                                                \
+  V(SignatureData, "SignatureData")                                            \
   V(RedirectionData, "RedirectionData")                                        \
   V(Field, "Field")                                                            \
   V(LiteralToken, "LiteralToken")                                              \
   V(TokenStream, "TokenStream")                                                \
   V(Script, "Script")                                                          \
   V(LibraryClass, "Library")                                                   \
   V(LibraryPrefix, "LibraryPrefix")                                            \
   V(Namespace, "Namespace")                                                    \
   V(Code, "Code")                                                              \
   V(Instructions, "Instructions")                                              \
@@ skipping 495 matching lines @@
   friend class Serializer;
   friend class Deserializer;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_SYMBOLS_H_