This is useful for two reasons: 1) If the hole case is never hit then we should just emit less code. The hole check becomes a speculation check instead of a jump over some slow path code. 2) It gives us some ability to bloat the hole case code if we need to, for example if it becomes useful for contiguous array inference.
Created attachment 164683 [details] work in progress
Comment on attachment 164683 [details] work in progress Attachment 164683 [details] did not pass qt-ews (qt): Output: http://queues.webkit.org/results/13903416
Comment on attachment 164683 [details] work in progress Attachment 164683 [details] did not pass qt-wk2-ews (qt): Output: http://queues.webkit.org/results/13898436
Comment on attachment 164683 [details] work in progress Attachment 164683 [details] did not pass efl-ews (efl): Output: http://queues.webkit.org/results/13892465
Comment on attachment 164683 [details] work in progress Attachment 164683 [details] did not pass win-ews (win): Output: http://queues.webkit.org/results/13899447
Created attachment 164699 [details] the patch
Comment on attachment 164699 [details] the patch r=me
Landed in http://trac.webkit.org/changeset/129045