Configure TF workspace via recursive workspace files (#4663)
Configure TF workspace via recursive workspace files (#4663)

This is the new way to configure TF that should allow them to change
things without breaking all dependent projects (like the issue we've
had with tf_toolchains becoming a requirement).

https://github.com/tensorflow/tensorflow/blob/b4bf78ffecff336746e3b6f2411e02087ab70aa6/WORKSPACE
explains the motivation.
iree-org/iree,iree-org/iree,google/iree,google/iree,iree-org/iree,google/iree,google/iree,iree-org/iree,iree-org/iree,iree-org/iree,google/iree,iree-org/iree,google/iree,google/iree