DataGrid recently started using Map for the objects in DataGrid.columns. These should be Object instead of Map. JSC can JIT property access to objects, but not Map.
We can use bracket notation if strings are more desirable, though I don't know if JSC can JIT those as well as fully qualified identifiers.
*** Bug 130035 has been marked as a duplicate of this bug. ***
Created attachment 230387 [details]
Comment on attachment 230387 [details]
Clearing flags on attachment: 230387
Committed r167955: <http://trac.webkit.org/changeset/167955>
All reviewed patches have been landed. Closing bug.