[heap] Remove unused no marking scope.

src/heap/incremental-marking.cc

 // 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.
 
 #include "src/heap/incremental-marking.h"
 
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/conversions.h"
 #include "src/heap/gc-idle-time-handler.h"
@@ skipping 21 matching lines @@
       steps_count_(0),
       old_generation_space_available_at_start_of_incremental_(0),
       old_generation_space_used_at_start_of_incremental_(0),
       bytes_rescanned_(0),
       should_hurry_(false),
       marking_speed_(0),
       bytes_scanned_(0),
       allocated_(0),
       write_barriers_invoked_since_last_step_(0),
       idle_marking_delay_counter_(0),
-      no_marking_scope_depth_(0),
       unscanned_bytes_of_large_object_(0),
       was_activated_(false),
       black_allocation_(false),
       finalize_marking_completed_(false),
       incremental_marking_finalization_rounds_(0),
       request_type_(NONE) {}
 
 bool IncrementalMarking::BaseRecordWrite(HeapObject* obj, Object* value) {
   HeapObject* value_heap_obj = HeapObject::cast(value);
   MarkBit value_bit = Marking::MarkBitFrom(value_heap_obj);
@@ skipping 1092 matching lines @@
           kWriteBarriersInvokedThreshold) {
     return 0;
   }
 
   // If an idle notification happened recently, we delay marking steps.
   if (marking == DO_NOT_FORCE_MARKING &&
       heap_->RecentIdleNotificationHappened()) {
     return 0;
   }
 
-  if (state_ == MARKING && no_marking_scope_depth_ > 0) return 0;
-
   intptr_t bytes_processed = 0;
   {
     HistogramTimerScope incremental_marking_scope(
         heap_->isolate()->counters()->gc_incremental_marking());
     TRACE_EVENT0("v8", "V8.GCIncrementalMarking");
     double start = heap_->MonotonicallyIncreasingTimeInMs();
 
     // The marking speed is driven either by the allocation rate or by the rate
     // at which we are having to check the color of objects in the write
     // barrier.
@@ skipping 79 matching lines @@
 void IncrementalMarking::IncrementIdleMarkingDelayCounter() {
   idle_marking_delay_counter_++;
 }
 
 
 void IncrementalMarking::ClearIdleMarkingDelayCounter() {
   idle_marking_delay_counter_ = 0;
 }
 }  // namespace internal
 }  // namespace v8