Use worst-fit allocation in old space for prentured objects.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 843b8d701cbcb3cf2b09d3eedf80bc2cb65c1852..05d9a07e7f2dd7a20ea2e8271f27fd09bcdc0c23 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -8867,7 +8867,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_AllocateInOldPointerSpace) {
   Heap* heap = isolate->heap();
   Object* allocation;
   { MaybeObject* maybe_allocation =
-        heap->old_pointer_space()->AllocateRaw(size);
+        heap->old_pointer_space()->AllocateRaw<FreeList::WORST_FIT>(size);
     if (maybe_allocation->ToObject(&allocation)) {
       heap->CreateFillerObjectAt(HeapObject::cast(allocation)->address(), size);
     }