Also allocate small typed arrays on heap when initialized from an array-like

src/layout-descriptor-inl.h

Index: src/layout-descriptor-inl.h
diff --git a/src/layout-descriptor-inl.h b/src/layout-descriptor-inl.h
index ba76704d5fc1f5c8883838a61de046268129c0d9..77671328b4c1b745a55bbfea1f99d9bb9e0f05e4 100644
--- a/src/layout-descriptor-inl.h
+++ b/src/layout-descriptor-inl.h
@@ -21,8 +21,8 @@ Handle<LayoutDescriptor> LayoutDescriptor::New(Isolate* isolate, int length) {
     return handle(LayoutDescriptor::FromSmi(Smi::FromInt(0)), isolate);
   }
   length = GetSlowModeBackingStoreLength(length);
-  return Handle<LayoutDescriptor>::cast(
-      isolate->factory()->NewFixedTypedArray(length, kExternalUint32Array));
+  return Handle<LayoutDescriptor>::cast(isolate->factory()->NewFixedTypedArray(
+      length, kExternalUint32Array, true));
 }