Get rid of unused field has_compiled_code_ from the Isolate structure.

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 RUNTIME_VM_ISOLATE_H_
 #define RUNTIME_VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/atomic.h"
@@ skipping 295 matching lines @@
     ASSERT(debugger_ != NULL);
     return debugger_;
   }
 
   void set_single_step(bool value) { single_step_ = value; }
   bool single_step() const { return single_step_; }
   static intptr_t single_step_offset() {
     return OFFSET_OF(Isolate, single_step_);
   }
 
-  void set_has_compiled_code(bool value) { has_compiled_code_ = value; }
-  bool has_compiled_code() const { return has_compiled_code_; }
-
   // Lets the embedder know that a service message resulted in a resume request.
   void SetResumeRequest() {
     resume_request_ = true;
     set_last_resume_timestamp();
   }
 
   void set_last_resume_timestamp() {
     last_resume_timestamp_ = OS::GetCurrentTimeMillis();
   }
 
@@ skipping 394 matching lines @@
   uint64_t pause_capability_;
   uint64_t terminate_capability_;
   bool errors_fatal_;
   void* init_callback_data_;
   Dart_EnvironmentCallback environment_callback_;
   Dart_LibraryTagHandler library_tag_handler_;
   ApiState* api_state_;
   Debugger* debugger_;
   bool resume_request_;
   int64_t last_resume_timestamp_;
-  bool has_compiled_code_;  // Can check that no compilation occured.
   Random random_;
   Simulator* simulator_;
   Mutex* mutex_;          // Protects compiler stats.
   Mutex* symbols_mutex_;  // Protects concurrent access to the symbol table.
   Mutex* type_canonicalization_mutex_;      // Protects type canonicalization.
   Mutex* constant_canonicalization_mutex_;  // Protects const canonicalization.
   Mutex* megamorphic_lookup_mutex_;  // Protects megamorphic table lookup.
   MessageHandler* message_handler_;
   IsolateSpawnState* spawn_state_;
   bool is_runnable_;
@@ skipping 249 matching lines @@
   intptr_t* spawn_count_;
 
   Dart_IsolateFlags isolate_flags_;
   bool paused_;
   bool errors_are_fatal_;
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_ISOLATE_H_