Revert of Remove ExternalArray, derived types, and element kinds

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 1d594d3eb5a6eda62470d908f7669c9b30028cbe..e2a5e05693a1202c1f1a41b1ccc7bb47d78580ee 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -883,14 +883,18 @@
 }
 
 
-Handle<FixedTypedArrayBase> Factory::NewFixedTypedArrayWithExternalPointer(
-    int length, ExternalArrayType array_type, void* external_pointer,
-    PretenureFlag pretenure) {
+Handle<ExternalArray> Factory::NewExternalArray(int length,
+                                                ExternalArrayType array_type,
+                                                void* external_pointer,
+                                                PretenureFlag pretenure) {
   DCHECK(0 <= length && length <= Smi::kMaxValue);
   CALL_HEAP_FUNCTION(
-      isolate(), isolate()->heap()->AllocateFixedTypedArrayWithExternalPointer(
-                     length, array_type, external_pointer, pretenure),
-      FixedTypedArrayBase);
+      isolate(),
+      isolate()->heap()->AllocateExternalArray(length,
+                                               array_type,
+                                               external_pointer,
+                                               pretenure),
+      ExternalArray);
 }
 
 
@@ -1761,11 +1765,11 @@
   switch (type) {
 #define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
   case kExternal##Type##Array:                          \
-    return TYPE##_ELEMENTS;
+    return EXTERNAL_##TYPE##_ELEMENTS;
     TYPED_ARRAYS(TYPED_ARRAY_CASE)
   }
   UNREACHABLE();
-  return FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND;
+  return FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND;
 #undef TYPED_ARRAY_CASE
 }
 
@@ -1907,7 +1911,7 @@
   Handle<Object> length_object = NewNumberFromSize(length);
   obj->set_length(*length_object);
 
-  Handle<FixedTypedArrayBase> elements = NewFixedTypedArrayWithExternalPointer(
+  Handle<ExternalArray> elements = NewExternalArray(
       static_cast<int>(length), type,
       static_cast<uint8_t*>(buffer->backing_store()) + byte_offset);
   Handle<Map> map = JSObject::GetElementsTransitionMap(obj, elements_kind);