Update LLAMA v2 init (#1781)
Summary:
This was a miss
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1781
Reviewed By: xuzhao9
Differential Revision: D47741286
Pulled By: msaroufim
fbshipit-source-id: 434625c863fcc75d637595e8da5ea3facf631819
