Introduce {FAST,SLOW}_STRING_WRAPPER_ELEMENTS

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index f1112e4976a21a6d5ff04545645c606a4f6a6f63..da3e89d8442ea5e71bd597ee4e26ccf2baaa1ac9 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -395,11 +395,6 @@ class Factory final {
 
   // JS arrays are pretenured when allocated by the parser.
 
-  // Create a JSArray with no elements.
-  Handle<JSArray> NewJSArray(ElementsKind elements_kind,
-                             Strength strength = Strength::WEAK,
-                             PretenureFlag pretenure = NOT_TENURED);
-
   // Create a JSArray with a specified length and elements initialized
   // according to the specified mode.
   Handle<JSArray> NewJSArray(
@@ -704,6 +699,11 @@ class Factory final {
                                  Handle<SharedFunctionInfo> info,
                                  Handle<Context> context,
                                  PretenureFlag pretenure = TENURED);
+
+  // Create a JSArray with no elements and no length.
+  Handle<JSArray> NewJSArray(ElementsKind elements_kind,

[Jakob Kummerow, 2016/01/26 14:21:24]

This function creates JSArray objects in inconsistent state (length ==
undefined)! Must not be called from the outside -> made it private.

+                             Strength strength = Strength::WEAK,
+                             PretenureFlag pretenure = NOT_TENURED);
 };
 
 }  // namespace internal