Version 3.26.31.2 (merged r21743)

Fix invalid attributes when generalizing because of incompatible map change.

BUG=382143
LOG=N
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/321383002

git-svn-id: https://v8.googlecode.com/svn/branches/3.26@21753 ce2b1a6d-e550-0410-aec6-3dcde31c8c00