Enable stub generation using Hydrogen/Lithium (again)

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 3dc6188997bdead58671bc9982202033e64f5e38..be6e940135c9318bf53c6fdcf3be56acd341f29c 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4232,6 +4232,7 @@ class Code: public HeapObject {
   V(FUNCTION)             \
   V(OPTIMIZED_FUNCTION)   \
   V(STUB)                 \
+  V(COMPILED_STUB)        \
   V(BUILTIN)              \
   V(LOAD_IC)              \
   V(KEYED_LOAD_IC)        \
@@ -4878,6 +4879,10 @@ class Map: public HeapObject {
     return IsFastDoubleElementsKind(elements_kind());
   }
 
+  inline bool has_fast_elements() {
+    return IsFastElementsKind(elements_kind());
+  }
+
   inline bool has_non_strict_arguments_elements() {
     return elements_kind() == NON_STRICT_ARGUMENTS_ELEMENTS;
   }