Reland "VM: Handle null-comparisons in the flow graph type propagation"

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 208 matching lines @@
   V(_CapabilityImpl, "_CapabilityImpl")                                        \
   V(_RawReceivePortImpl, "_RawReceivePortImpl")                                \
   V(_SendPortImpl, "_SendPortImpl")                                            \
   V(_StackTrace, "_StackTrace")                                                \
   V(_RegExp, "_RegExp")                                                        \
   V(RegExp, "RegExp")                                                          \
   V(ColonMatcher, ":matcher")                                                  \
   V(ColonStream, ":stream")                                                    \
   V(Object, "Object")                                                          \
   V(Int, "int")                                                                \
+  V(Int64, "_int64")                                                           \
   V(Double, "double")                                                          \
   V(Float32x4, "Float32x4")                                                    \
   V(Float64x2, "Float64x2")                                                    \
   V(Int32x4, "Int32x4")                                                        \
   V(_Float32x4, "_Float32x4")                                                  \
   V(_Float64x2, "_Float64x2")                                                  \
   V(_Int32x4, "_Int32x4")                                                      \
   V(Int8List, "Int8List")                                                      \
   V(Uint8List, "Uint8List")                                                    \
   V(Uint8ClampedList, "Uint8ClampedList")                                      \
@@ skipping 451 matching lines @@
   friend class Serializer;
   friend class Deserializer;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_SYMBOLS_H_