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

runtime/vm/object.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_OBJECT_H_
 #define RUNTIME_VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 5794 matching lines @@
     return !IsFunctionType() && HasResolvedTypeClass() &&
            Class::Handle(type_class()).IsObjectClass();
   }
 
   // Check if this type represents the 'bool' type.
   bool IsBoolType() const;
 
   // Check if this type represents the 'int' type.
   bool IsIntType() const;
 
+  // Check if this type represents the '_int64' type.
+  bool IsInt64Type() const;
+
   // Check if this type represents the 'double' type.
   bool IsDoubleType() const;
 
   // Check if this type represents the 'Float32x4' type.
   bool IsFloat32x4Type() const;
 
   // Check if this type represents the 'Float64x2' type.
   bool IsFloat64x2Type() const;
 
   // Check if this type represents the 'Int32x4' type.
@@ skipping 134 matching lines @@
 
   // The 'Object' type.
   static RawType* ObjectType();
 
   // The 'bool' type.
   static RawType* BoolType();
 
   // The 'int' type.
   static RawType* IntType();
 
+  // The '_int64' type.
+  static RawType* Int64Type();
+
   // The 'Smi' type.
   static RawType* SmiType();
 
   // The 'Mint' type.
   static RawType* MintType();
 
   // The 'double' type.
   static RawType* Double();
 
   // The 'Float32x4' type.
@@ skipping 2977 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_OBJECT_H_