Implement direct allocation in old data space infrastructure.

src/heap-inl.h

Index: src/heap-inl.h
diff --git a/src/heap-inl.h b/src/heap-inl.h
index 9ed65d8107ddc04a38e72b61c1002c483562bcf4..b3549bb83d78fa6fe3ba87a6b5d1a87463be7fdf 100644
--- a/src/heap-inl.h
+++ b/src/heap-inl.h
@@ -345,6 +345,16 @@ bool Heap::InOldPointerSpace(Object* object) {
 }
 
 
+bool Heap::InOldDataSpace(Address address) {
+  return old_data_space_->Contains(address);
+}
+
+
+bool Heap::InOldDataSpace(Object* object) {
+  return InOldDataSpace(reinterpret_cast<Address>(object));
+}
+
+
 bool Heap::OldGenerationAllocationLimitReached() {
   if (!incremental_marking()->IsStopped()) return false;
   return OldGenerationSpaceAvailable() < 0;