bug fix when we prepack weight and bias together (#17145)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17145
Prepacked weight contains both weight and bias, so the bias should be obtained from input index 1, not from 2
Reviewed By: jianyuh
Differential Revision: D14097281
fbshipit-source-id: b8b836b85a7b240e2fd1734377c46d9bf2ce3390
