Disable the pending task if the memory reducer is torn down.

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/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 5868 matching lines @@
            map_space_->MaximumCommittedMemory());
     PrintF("maximum_committed_by_lo_space=%" V8_PTR_PREFIX "d ",
            lo_space_->MaximumCommittedMemory());
     PrintF("\n\n");
   }
 
   if (FLAG_verify_predictable) {
     PrintAlloctionsHash();
   }
 
+  memory_reducer_.TearDown();
+
   TearDownArrayBuffers();
 
   isolate_->global_handles()->TearDown();
 
   external_string_table_.TearDown();
 
   mark_compact_collector()->TearDown();
 
   new_space_.TearDown();
 
@@ skipping 993 matching lines @@
     *object_type = "CODE_TYPE";                                                \
     *object_sub_type = "CODE_AGE/" #name;                                      \
     return true;
     CODE_AGE_LIST_COMPLETE(COMPARE_AND_RETURN_NAME)
 #undef COMPARE_AND_RETURN_NAME
   }
   return false;
 }
 }  // namespace internal
 }  // namespace v8