Return descriptor ownership after TrimDescriptorArray to allow resharing of descriptor arrays

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 530fb6d804d5d7eb5a4bccd380eaa40b60733ff3..0c46ad603c579261bdb7e0e3caf3851a87ecdb54 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -9246,6 +9246,8 @@ static void TrimDescriptorArray(Heap* heap,
 
   if (descriptors->HasEnumCache()) TrimEnumCache(heap, map, descriptors);
   descriptors->Sort();
+
+  map->set_owns_descriptors(true);

[Michael Starzinger, 2013/10/16 09:34:06]

nit: Can we hoist this out of this helper into Map::ClearNonLiveTransitions()?
Otherwise the semantics of TrimDescriptorArray get blurred and it magically does
other things.

[rmcilroy, 2013/10/16 10:44:01]

Makes sense, done.

 }