make repeat respect the current stream (#26946)
Summary:
Kernel launch did not have the stream argument.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26946
Test Plan: should be covered by current tests
Differential Revision: D17629397
Pulled By: ngimel
fbshipit-source-id: f91a72d0908b5672c6df045c9df49bf1d48a5ac9
