Eliminate AdjustBatch ops (#19083)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19083
As we have discussed, there are too many of AdjustBatch ops and they incur reallocation overhead and affects the performance. We will eliminate these ops by
- inling the input adjust batch op into Glow
- inling the output adjust batch op into OnnxifiOp and do that only conditionally.
This is the C2 part of the change and requires change from Glow side to work e2e.
Reviewed By: rdzhabarov
Differential Revision: D14860582
fbshipit-source-id: ac2588b894bac25735babb62b1924acc559face6
