Remove sweeper threads

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include "include/v8-debug.h"
 #include "src/allocation.h"
 #include "src/assert-scope.h"
@@ skipping 1042 matching lines @@
     // Thread is only available with flag enabled.
     DCHECK(optimizing_compiler_thread_ == NULL ||
            FLAG_concurrent_recompilation);
     return optimizing_compiler_thread_ != NULL && FLAG_concurrent_osr;
   }
 
   OptimizingCompilerThread* optimizing_compiler_thread() {
     return optimizing_compiler_thread_;
   }
 
-  int num_sweeper_threads() const {
-    return num_sweeper_threads_;
-  }
-
-  SweeperThread** sweeper_threads() {
-    return sweeper_thread_;
-  }
-
   int id() const { return static_cast<int>(id_); }
 
   HStatistics* GetHStatistics();
   HStatistics* GetTStatistics();
   HTracer* GetHTracer();
   CodeTracer* GetCodeTracer();
 
   FunctionEntryHook function_entry_hook() { return function_entry_hook_; }
   void set_function_entry_hook(FunctionEntryHook function_entry_hook) {
     function_entry_hook_ = function_entry_hook;
@@ skipping 231 matching lines @@
   // between compilation units.
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                              \
   static const intptr_t name##_debug_offset_;
   ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
   ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
   DeferredHandles* deferred_handles_head_;
   OptimizingCompilerThread* optimizing_compiler_thread_;
-  SweeperThread** sweeper_thread_;
-  int num_sweeper_threads_;
 
   // Counts deopt points if deopt_every_n_times is enabled.
   unsigned int stress_deopt_count_;
 
   int next_optimization_id_;
 
   // List of callbacks when a Call completes.
   List<CallCompletedCallback> call_completed_callbacks_;
 
   v8::Isolate::UseCounterCallback use_counter_callback_;
@@ skipping 220 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_