Summary:
(1) BlobsQueue is causing a gcc error (google search suggeste it was a
bug, but we'll put the implementation in a separate cc file).
(2) Preparing for cuda 9: update cub.
(3) Prepare for cudnn 7: update cudnn rnn op.
(4) Fix an MSVC issue
Reviewed By: sf-wind, jerryzh168
Differential Revision: D5574352
fbshipit-source-id: 230820ce3ceaa32bee8323bdc509de352c93fcf2
