Respect old space allocation limit in PagedSpace::AllocateRaw.

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index f3c2eb0abb0134f9f96da51d2d52960c088fcd69..827f3abb607a9ec7e8a82d58de548bd3e83c37e8 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -2618,7 +2618,7 @@ HeapObject* PagedSpace::SlowAllocateRaw(int size_in_bytes) {
     // If sweeper threads are active, wait for them at that point and steal
     // elements form their free-lists.
     HeapObject* object = WaitForSweeperThreadsAndRetryAllocation(size_in_bytes);
-    if (object != NULL) return object;
+    return object;
   }
 
   // Try to expand the space and allocate in the new next page.