Allow FastCloneShallowObjectStub to use AllocationMementos.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 99687caf91e9963727301762e6ce2d2f61af1974..1d129d5e245d1f3145f1b74df5363c5bf7be82c3 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -4335,9 +4335,18 @@ void HOptimizedGraphBuilder::VisitObjectLiteral(ObjectLiteral* expr) {
 
   // Check whether to use fast or slow deep-copying for boilerplate.
   int max_properties = kMaxFastLiteralProperties;
-  Handle<Object> boilerplate(closure->literals()->get(
-      expr->literal_index()), isolate());
-  if (boilerplate->IsJSObject() &&
+  Handle<Object> literals_cell(closure->literals()->get(expr->literal_index()),
+                               isolate());
+  Handle<AllocationSite> site;
+  Handle<Object> boilerplate;

[Michael Starzinger, 2013/10/10 13:27:39]

nit: The type of "boilerplate" should be Handle<JSObject>.

[mvstanton, 2013/10/10 14:09:04]

Done.

+  if (!literals_cell->IsUndefined()) {
+    // Retrieve the boilerplate
+    ASSERT(literals_cell->IsAllocationSite());
+    site = Handle<AllocationSite>::cast(literals_cell);
+    boilerplate = Handle<Object>(site->transition_info(), isolate());
+  }
+
+  if (!boilerplate.is_null() &&
       IsFastLiteral(Handle<JSObject>::cast(boilerplate),
                     kMaxFastLiteralDepth,
                     &max_properties)) {