Reland of [heap] Simplify distribution of remaining memory during sweeping & compaction

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index 3e5dafe345a481f08f88f20fd971db40e8894af7..2465fac3b615ea780297b37ed7d83e0180798a29 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -3281,18 +3281,10 @@
 
   // Set up compaction spaces.
   Evacuator** evacuators = new Evacuator*[num_tasks];
-  CompactionSpaceCollection** compaction_spaces_for_tasks =
-      new CompactionSpaceCollection*[num_tasks];
   for (int i = 0; i < num_tasks; i++) {
     evacuators[i] = new Evacuator(this, evacuation_candidates_,
                                   newspace_evacuation_candidates_);
-    compaction_spaces_for_tasks[i] = evacuators[i]->compaction_spaces();
-  }
-  heap()->old_space()->DivideUponCompactionSpaces(compaction_spaces_for_tasks,
-                                                  num_tasks);
-  heap()->code_space()->DivideUponCompactionSpaces(compaction_spaces_for_tasks,
-                                                   num_tasks);
-  delete[] compaction_spaces_for_tasks;
+  }
 
   // Kick off parallel tasks.
   StartParallelCompaction(evacuators, num_tasks);