make cond call fake kernel in dynamo (#147045)
Summary:
X-link: https://github.com/pytorch/pytorch/pull/147045
Approved by: https://github.com/zou3519
ghstack dependencies: #146954
Reviewed By: huydhn
Differential Revision: D69690770
fbshipit-source-id: 7c7ba8b259deac5af15c9f45fb1bf37b1c17a966
