Reland "LayoutDescriptor should inherit from JSTypedArray"

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index 87ec2e6e701b9e7bc4125e170d5f556eaab71ca5..72991d9bf0ca7ef405c170a6f19029a5a2f3305f 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -448,11 +448,17 @@ class Factory final {
 
   Handle<JSTypedArray> NewJSTypedArray(ExternalArrayType type);
 
+  Handle<JSTypedArray> NewJSTypedArray(ElementsKind elements_kind);
+
   // Creates a new JSTypedArray with the specified buffer.
   Handle<JSTypedArray> NewJSTypedArray(ExternalArrayType type,
                                        Handle<JSArrayBuffer> buffer,
                                        size_t byte_offset, size_t length);
 
+  // Creates a new on-heap JSTypedArray.
+  Handle<JSTypedArray> NewJSTypedArray(ElementsKind elements_kind,
+                                       size_t number_of_elements);
+
   Handle<JSDataView> NewJSDataView();
   Handle<JSDataView> NewJSDataView(Handle<JSArrayBuffer> buffer,
                                    size_t byte_offset, size_t byte_length);