Captured arguments object materialization

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 9655d383324f43e5410e2454297c0c0ea3f75fb9..6a72cb88b24bdc01e63e9e0195f6f6961bc37546 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -201,7 +201,8 @@ namespace internal {
   V(Symbol, elements_transition_symbol, ElementsTransitionSymbol)              \
   V(SeededNumberDictionary, empty_slow_element_dictionary,                     \
       EmptySlowElementDictionary)                                              \
-  V(Symbol, observed_symbol, ObservedSymbol)
+  V(Symbol, observed_symbol, ObservedSymbol)                                   \
+  V(FixedArray, materialized_objects, MaterializedObjects)
 
 #define ROOT_LIST(V)                                  \
   STRONG_ROOT_LIST(V)                                 \
@@ -1367,6 +1368,10 @@ class Heap {
     roots_[kStoreBufferTopRootIndex] = reinterpret_cast<Smi*>(top);
   }
 
+  void public_set_materialized_objects(FixedArray* objects) {
+    roots_[kMaterializedObjectsRootIndex] = objects;
+  }
+
   // Generated code can embed this address to get access to the roots.
   Object** roots_array_start() { return roots_; }