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 7d46c068589bfb707a43e93d84bf5cc74e328275..79ff48a517eec44c2eb2e77dd8fc6d93ef1bda5e 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4234,6 +4234,7 @@ class Code: public HeapObject {
   V(FUNCTION)             \
   V(OPTIMIZED_FUNCTION)   \
   V(STUB)                 \
+  V(COMPILED_STUB)        \
   V(BUILTIN)              \
   V(LOAD_IC)              \
   V(KEYED_LOAD_IC)        \
@@ -4844,6 +4845,10 @@ 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;
   }