Reland of "Remove ExternalArray, derived types, and element kinds"

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 1c1f3c7357f2fb21ec1b6da90862bd6fe6af2f1c..5f2f9d3cd58010d086804aabb2b20921fe0a3231 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -235,11 +235,8 @@ class Genesis BASE_EMBEDDED {
                                           ElementsKind elements_kind);
   bool InstallNatives(ContextType context_type);
 
-  void InstallTypedArray(
-      const char* name,
-      ElementsKind elements_kind,
-      Handle<JSFunction>* fun,
-      Handle<Map>* external_map);
+  void InstallTypedArray(const char* name, ElementsKind elements_kind,
+                         Handle<JSFunction>* fun);
   bool InstallExperimentalNatives();
   bool InstallExtraNatives();
   void InstallBuiltinFunctionIds();
@@ -1284,17 +1281,12 @@ void Genesis::InitializeGlobal(Handle<GlobalObject> global_object,
   }
 
   {  // -- T y p e d A r r a y s
-#define INSTALL_TYPED_ARRAY(Type, type, TYPE, ctype, size)                    \
-    {                                                                         \
-      Handle<JSFunction> fun;                                                 \
-      Handle<Map> external_map;                                               \
-      InstallTypedArray(#Type "Array",                                        \
-          TYPE##_ELEMENTS,                                                    \
-          &fun,                                                               \
-          &external_map);                                                     \
-      native_context()->set_##type##_array_fun(*fun);                         \
-      native_context()->set_##type##_array_external_map(*external_map);       \
-    }
+#define INSTALL_TYPED_ARRAY(Type, type, TYPE, ctype, size)   \
+  {                                                          \
+    Handle<JSFunction> fun;                                  \
+    InstallTypedArray(#Type "Array", TYPE##_ELEMENTS, &fun); \
+    native_context()->set_##type##_array_fun(*fun);          \
+  }
     TYPED_ARRAYS(INSTALL_TYPED_ARRAY)
 #undef INSTALL_TYPED_ARRAY
 
@@ -1505,11 +1497,8 @@ void Genesis::InitializeGlobal(Handle<GlobalObject> global_object,
 }
 
 
-void Genesis::InstallTypedArray(
-    const char* name,
-    ElementsKind elements_kind,
-    Handle<JSFunction>* fun,
-    Handle<Map>* external_map) {
+void Genesis::InstallTypedArray(const char* name, ElementsKind elements_kind,
+                                Handle<JSFunction>* fun) {
   Handle<JSObject> global = Handle<JSObject>(native_context()->global_object());
   Handle<JSFunction> result = InstallFunction(
       global, name, JS_TYPED_ARRAY_TYPE, JSTypedArray::kSize,
@@ -1522,9 +1511,6 @@ void Genesis::InstallTypedArray(
   JSFunction::SetInitialMap(result, initial_map,
                             handle(initial_map->prototype(), isolate()));
   *fun = result;
-
-  ElementsKind external_kind = GetNextTransitionElementsKind(elements_kind);
-  *external_map = Map::AsElementsKind(initial_map, external_kind);
 }