Ensure that all goto instructions have deoptimization target.

runtime/vm/isolate.h

 // 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.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/thread.h"
@@ skipping 261 matching lines @@
   void ScheduleInterrupts(uword interrupt_bits);
   uword GetAndClearInterrupts();
 
   MessageHandler* message_handler() const { return message_handler_; }
   void set_message_handler(MessageHandler* value) { message_handler_ = value; }
 
   uword spawn_data() const { return spawn_data_; }
   void set_spawn_data(uword value) { spawn_data_ = value; }
 
   static const intptr_t kNoDeoptId = -1;
+  static const intptr_t kDeoptIdStep = 2;
+  static const intptr_t kDeoptIdBeforeOffset = 0;
+  static const intptr_t kDeoptIdAfterOffset = 1;
   intptr_t deopt_id() const { return deopt_id_; }
   void set_deopt_id(int value) {
     ASSERT(value >= 0);
     deopt_id_ = value;
   }
   intptr_t GetNextDeoptId() {
     ASSERT(deopt_id_ != kNoDeoptId);
-    return deopt_id_++;
+    const intptr_t id = deopt_id_;
+    deopt_id_ += kDeoptIdStep;
+    return id;
+  }
+
+  static intptr_t ToDeoptAfter(intptr_t deopt_id) {
+    ASSERT(IsDeoptBefore(deopt_id));
+    return deopt_id + kDeoptIdAfterOffset;
+  }
+
+  static bool IsDeoptBefore(intptr_t deopt_id) {
+    return (deopt_id % kDeoptIdStep) == kDeoptIdBeforeOffset;
+  }
+
+  static bool IsDeoptAfter(intptr_t deopt_id) {
+    return (deopt_id % kDeoptIdStep) == kDeoptIdAfterOffset;
   }
 
   RawArray* ic_data_array() const { return ic_data_array_; }
   void set_ic_data_array(RawArray* value) { ic_data_array_ = value; }
   ICData* GetICDataForDeoptId(intptr_t deopt_id) const;
 
   Debugger* debugger() const { return debugger_; }
 
   Simulator* simulator() const { return simulator_; }
   void set_simulator(Simulator* value) { simulator_ = value; }
@@ skipping 228 matching lines @@
   Isolate* new_isolate_;
   Isolate* saved_isolate_;
   uword saved_stack_limit_;
 
   DISALLOW_COPY_AND_ASSIGN(SwitchIsolateScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_