Fix #28740 demangle constructors in stack traces (A.A becomes new A).

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 404 matching lines @@
   V(position_registers, ":position_registers")                                 \
   V(string_param, ":string_param")                                             \
   V(start_index_param, ":start_index_param")                                   \
   V(clear, "clear")                                                            \
   V(_wordCharacterMap, "_wordCharacterMap")                                    \
   V(print, "print")                                                            \
   V(last, "last")                                                              \
   V(removeLast, "removeLast")                                                  \
   V(add, "add")                                                                \
   V(ConstructorClosurePrefix, "new#")                                          \
+  V(ConstructorStacktracePrefix, "new ")                                       \
   V(_runExtension, "_runExtension")                                            \
   V(_runPendingImmediateCallback, "_runPendingImmediateCallback")              \
   V(DartLibrary, "dart.library.")                                              \
   V(DartLibraryMirrors, "dart.library.mirrors")                                \
   V(_name, "_name")                                                            \
   V(_classRangeCheck, "_classRangeCheck")                                      \
   V(_classRangeCheckNegative, "_classRangeCheckNegative")                      \
   V(_classRangeAssert, "_classRangeAssert")                                    \
   V(_classIdEqualsAssert, "_classIdEqualsAssert")                              \
   V(GetRuntimeType, "get:runtimeType")                                         \
@@ skipping 258 matching lines @@
   friend class Serializer;
   friend class Deserializer;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_SYMBOLS_H_