Improve smi shift operations and avoid repeated deoptimizations.

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 VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 2768 matching lines @@
   }
 
   intptr_t num_args_tested() const {
     return raw_ptr()->num_args_tested_;
   }
 
   intptr_t deopt_id() const {
     return raw_ptr()->deopt_id_;
   }
 
+  intptr_t deopt_reason() const {
+    return raw_ptr()->deopt_reason_;
+  }
+
+  void set_deopt_reason(intptr_t reason) const;
+
   intptr_t NumberOfChecks() const;
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawICData));
   }
 
   static intptr_t target_name_offset() {
     return OFFSET_OF(RawICData, target_name_);
   }
 
@@ skipping 3062 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_