[automerger skipped] BidirectionalSequenceLSTM op: Fixes VTS test for merge_outputs
am: ea551fd12a -s ours
am skip reason: change_id I8829fd47094ca4af05e5d60da917499ce61acc5e with SHA1 723ff2dbfd is in history

Change-Id: I5b61b798c08aeab014727108bb0218307603c8bc