Fix 2346: Generic KeyedStoreIC doesn't change length and element_kind atomically
Fix 2346: Generic KeyedStoreIC doesn't change length and element_kind atomically

R=erik.corry@gmail.com
BUG=v8:2346

Review URL: https://chromiumcodereview.appspot.com/10991012

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@12603 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh