[heap] Do not delay mark-compact by doing scavenge.

src/heap/heap.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/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/assembler-inl.h"
 #include "src/ast/context-slot-cache.h"
@@ skipping 972 matching lines @@
   EnsureFillerObjectAtTop();
 
   if (IsYoungGenerationCollector(collector) &&
       !incremental_marking()->IsStopped()) {
     if (FLAG_trace_incremental_marking) {
       isolate()->PrintWithTimestamp(
           "[IncrementalMarking] Scavenge during marking.\n");
     }
   }
 
-  if (collector == MARK_COMPACTOR && FLAG_incremental_marking &&
-      !ShouldFinalizeIncrementalMarking() && !ShouldAbortIncrementalMarking() &&
-      !incremental_marking()->IsStopped() &&
-      !incremental_marking()->should_hurry() &&
-      !incremental_marking()->NeedsFinalization() &&
-      !IsCloseToOutOfMemory(new_space_->Capacity())) {
-    if (!incremental_marking()->IsComplete() &&
-        !mark_compact_collector()->marking_deque()->IsEmpty() &&
-        !FLAG_gc_global) {
-      if (FLAG_trace_incremental_marking) {
-        isolate()->PrintWithTimestamp(
-            "[IncrementalMarking] Delaying MarkSweep.\n");
-      }
-      collector = YoungGenerationCollector();
-      collector_reason = "incremental marking delaying mark-sweep";
-    }
-  }
-
   bool next_gc_likely_to_collect_more = false;
   size_t committed_memory_before = 0;
 
   if (collector == MARK_COMPACTOR) {
     committed_memory_before = CommittedOldGenerationMemory();
   }
 
   {
     tracer()->Start(collector, gc_reason, collector_reason);
     DCHECK(AllowHeapAllocation::IsAllowed());
@@ skipping 5380 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8