Fix TransitionElementsKindStub to handle non-JSArray objects correctly.

BUG=352982
LOG=N
TEST=mjsunit/regress/regress-352982.js
R=danno@chromium.org

Review URL: https://codereview.chromium.org/196343023

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20033 ce2b1a6d-e550-0410-aec6-3dcde31c8c00