[heap] Minor MC: Flush concurrent external memory counter

src/heap/mark-compact.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/mark-compact.h"
 
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
 #include "src/base/sys-info.h"
 #include "src/code-stubs.h"
@@ skipping 2592 matching lines @@
 
   heap()->incremental_marking()->UpdateMarkingDequeAfterScavenge();
 
   {
     TRACE_GC(heap()->tracer(), GCTracer::Scope::MINOR_MC_CLEAR_LIVENESS);
     for (Page* p : PageRange(heap()->new_space()->FromSpaceStart(),
                              heap()->new_space()->FromSpaceEnd())) {
       marking_state(p).ClearLiveness();
     }
   }
+
+  heap()->account_external_memory_concurrently_freed();
 }
 
 void MinorMarkCompactCollector::ClearNonLiveReferences() {
   TRACE_GC(heap()->tracer(), GCTracer::Scope::MC_CLEAR);
 
   {
     TRACE_GC(heap()->tracer(), GCTracer::Scope::MC_CLEAR_STRING_TABLE);
     // Internalized strings are always stored in old space, so there is no need
     // to clean them here.
     YoungGenerationExternalStringTableCleaner external_visitor(*this);
@@ skipping 1898 matching lines @@
       // The target is always in old space, we don't have to record the slot in
       // the old-to-new remembered set.
       DCHECK(!heap()->InNewSpace(target));
       RecordRelocSlot(host, &rinfo, target);
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8