Allow direct allocation in old pointer space.

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index b3640c3f54a10c3d2f79b0019ecf10db110dd0ce..1267d3f685b55c7d663c69aedb506773abfdfab2 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -1158,6 +1158,17 @@ ExternalReference ExternalReference::new_space_allocation_limit_address(
   return ExternalReference(isolate->heap()->NewSpaceAllocationLimitAddress());
 }
 
+ExternalReference ExternalReference::old_pointer_space_allocation_top_address(
+    Isolate* isolate) {
+  return ExternalReference(
+      isolate->heap()->OldPointerSpaceAllocationTopAddress());
+}
+
+ExternalReference ExternalReference::old_pointer_space_allocation_limit_address(
+    Isolate* isolate) {
+  return ExternalReference(
+      isolate->heap()->OldPointerSpaceAllocationLimitAddress());
+}
 
 ExternalReference ExternalReference::handle_scope_level_address(
     Isolate* isolate) {