Ensure newly allocated empty Arrays are transitioned to FAST_ELEMENT

src/contexts.h

Index: src/contexts.h
diff --git a/src/contexts.h b/src/contexts.h
index eec86f125baac12ea919a73ffc37eb8f7db6152b..a460f204849d68630f0b8be573166ecebf6a55a8 100644
--- a/src/contexts.h
+++ b/src/contexts.h
@@ -106,6 +106,8 @@ enum BindingFlags {
   V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \
   V(INTERNAL_ARRAY_FUNCTION_INDEX, JSFunction, internal_array_function) \
   V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \
+  V(FAST_ARRAY_ELEMENT_BIAS_INDEX, Object, fast_array_element_bias) \
+  V(UNTRANSITIONED_JS_ARRAY_MAP_INDEX, Object, untransitioned_js_array_map) \
   V(DATE_FUNCTION_INDEX, JSFunction, date_function) \
   V(JSON_OBJECT_INDEX, JSObject, json_object) \
   V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \
@@ -129,7 +131,6 @@ enum BindingFlags {
   V(FUNCTION_INSTANCE_MAP_INDEX, Map, function_instance_map) \
   V(STRICT_MODE_FUNCTION_INSTANCE_MAP_INDEX, Map, \
     strict_mode_function_instance_map) \
-  V(JS_ARRAY_MAP_INDEX, Map, js_array_map)\
   V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map)\
   V(ARGUMENTS_BOILERPLATE_INDEX, JSObject, arguments_boilerplate) \
   V(ALIASED_ARGUMENTS_BOILERPLATE_INDEX, JSObject, \
@@ -231,7 +232,6 @@ class Context: public FixedArray {
     ARGUMENTS_BOILERPLATE_INDEX,
     ALIASED_ARGUMENTS_BOILERPLATE_INDEX,
     STRICT_MODE_ARGUMENTS_BOILERPLATE_INDEX,
-    JS_ARRAY_MAP_INDEX,
     REGEXP_RESULT_MAP_INDEX,
     FUNCTION_MAP_INDEX,
     STRICT_MODE_FUNCTION_MAP_INDEX,
@@ -247,6 +247,8 @@ class Context: public FixedArray {
     OBJECT_FUNCTION_INDEX,
     INTERNAL_ARRAY_FUNCTION_INDEX,
     ARRAY_FUNCTION_INDEX,
+    UNTRANSITIONED_JS_ARRAY_MAP_INDEX,
+    FAST_ARRAY_ELEMENT_BIAS_INDEX,
     DATE_FUNCTION_INDEX,
     JSON_OBJECT_INDEX,
     REGEXP_FUNCTION_INDEX,