PTAL

https://codereview.chromium.org/715313003/diff/1/src/objects.cc
File src/objects.cc (right):

https://codereview.chromium.org/715313003/diff/1/src/objects.cc#newcode2480
src/objects.cc:2480: old_map->transitions()->IsSimpleTransition())) {
On 2014/11/12 22:52:48, Toon Verwaest wrote:
What about instead updating the fieldtype in the entire tree? There's
infrastructure to do that. Knowing we have a simple transition doesn't
guarantee
(I believe) that we are sharing the descriptor array...

Done, thanks!

https://codereview.chromium.org/715313003/

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