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

runtime/vm/object_store.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/object_store.h"
 
 #include "vm/exceptions.h"
 #include "vm/dart_entry.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/raw_object.h"
 #include "vm/resolver.h"
 #include "vm/symbols.h"
 #include "vm/visitor.h"
 
 namespace dart {
 
 ObjectStore::ObjectStore()
     : object_class_(Class::null()),
       object_type_(Type::null()),
       null_class_(Class::null()),
       null_type_(Type::null()),
       function_type_(Type::null()),
       closure_class_(Class::null()),
       number_type_(Type::null()),
       int_type_(Type::null()),
       integer_implementation_class_(Class::null()),
-      int64_type_(Type::null()),
       smi_class_(Class::null()),
       smi_type_(Type::null()),
       mint_class_(Class::null()),
       mint_type_(Type::null()),
       bigint_class_(Class::null()),
       double_class_(Class::null()),
       double_type_(Type::null()),
       float32x4_type_(Type::null()),
       int32x4_type_(Type::null()),
       float64x2_type_(Type::null()),
@@ skipping 273 matching lines @@
   simple_instance_of_function_ =
       PrivateObjectLookup(Symbols::_simpleInstanceOf());
   simple_instance_of_true_function_ =
       PrivateObjectLookup(Symbols::_simpleInstanceOfTrue());
   simple_instance_of_false_function_ =
       PrivateObjectLookup(Symbols::_simpleInstanceOfFalse());
 #endif
 }
 
 }  // namespace dart