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

test/cctest/heap/heap-utils.cc

Index: test/cctest/heap/heap-utils.cc
diff --git a/test/cctest/heap/heap-utils.cc b/test/cctest/heap/heap-utils.cc
index 4f7d088a9462bdb17e3e9cddde0284d1139e2cb3..96665126832e5e13d30d0b64d71142c44f6510a1 100644
--- a/test/cctest/heap/heap-utils.cc
+++ b/test/cctest/heap/heap-utils.cc
@@ -170,6 +170,10 @@ void SimulateIncrementalMarking(i::Heap* heap, bool force_completion) {
 }
 
 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();