Preliminary code for block scopes and block contexts.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 70ed47be1f4edb17dd08033249d13b00ea273a44..3e86e394967f286df282d66a70ce419627857c1c 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -552,7 +552,8 @@ bool Object::IsContext() {
     return (map == heap->function_context_map() ||
             map == heap->catch_context_map() ||
             map == heap->with_context_map() ||
-            map == heap->global_context_map());
+            map == heap->global_context_map() ||
+            map == heap->block_context_map());
   }
   return false;
 }
@@ -565,6 +566,13 @@ bool Object::IsGlobalContext() {
 }
 
 
+bool Object::IsSerializedScopeInfo() {
+  return Object::IsHeapObject() &&
+      HeapObject::cast(this)->map() ==
+      HeapObject::cast(this)->GetHeap()->serialized_scope_info_map();
+}
+
+
 bool Object::IsJSFunction() {
   return Object::IsHeapObject()
       && HeapObject::cast(this)->map()->instance_type() == JS_FUNCTION_TYPE;