[heap] Use size_t in free list and evacuation candidate selection.

test/cctest/heap/heap-utils.cc

 // Copyright 2016 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 "test/cctest/heap/heap-utils.h"
 
 #include "src/factory.h"
 #include "src/heap/heap-inl.h"
 #include "src/heap/incremental-marking.h"
 #include "src/heap/mark-compact.h"
@@ skipping 152 matching lines @@
     marking->Step(i::MB, i::IncrementalMarking::NO_GC_VIA_STACK_GUARD,
                   i::IncrementalMarking::FORCE_COMPLETION, i::StepOrigin::kV8);
     if (marking->IsReadyToOverApproximateWeakClosure()) {
       marking->FinalizeIncrementally();
     }
   }
   CHECK(marking->IsComplete());
 }
 
 void SimulateFullSpace(v8::internal::PagedSpace* space) {
+  i::MarkCompactCollector* collector = space->heap()->mark_compact_collector();
+  if (collector->sweeping_in_progress()) {
+    collector->EnsureSweepingCompleted();
+  }
   space->EmptyAllocationInfo();
   space->ResetFreeList();
   space->ClearStats();
 }
 
 void AbandonCurrentlyFreeMemory(PagedSpace* space) {
   space->EmptyAllocationInfo();
   for (Page* page : *space) {
     page->MarkNeverAllocateForTesting();
   }
 }
 
 void GcAndSweep(Heap* heap, AllocationSpace space) {
   heap->CollectGarbage(space, GarbageCollectionReason::kTesting);
   if (heap->mark_compact_collector()->sweeping_in_progress()) {
     heap->mark_compact_collector()->EnsureSweepingCompleted();
   }
 }
 
 }  // namespace heap
 }  // namespace internal
 }  // namespace v8