Simplify old space allocation strategy.

src/mark-compact.h

Index: src/mark-compact.h
diff --git a/src/mark-compact.h b/src/mark-compact.h
index 83aa1e8792c7e964c85de7083dbf8fb4206def15..f873295d8adc9cfa6cf8aff9b2942a9a735a0cb0 100644
--- a/src/mark-compact.h
+++ b/src/mark-compact.h
@@ -694,7 +694,7 @@ class MarkCompactCollector {
 
   void WaitUntilSweepingCompleted();
 
-  intptr_t RefillFreeLists(PagedSpace* space);
+  void RefillFreeList(PagedSpace* space);
 
   bool AreSweeperThreadsActivated();
 
@@ -713,7 +713,7 @@ class MarkCompactCollector {
   void MarkWeakObjectToCodeTable();
 
   // Special case for processing weak references in a full collection. We need
-  // to artifically keep AllocationSites alive for a time.
+  // to artificially keep AllocationSites alive for a time.
   void MarkAllocationSite(AllocationSite* site);
 
  private: