Update HF version to commit hash (6c26faa) (#107400)
Some [errors](https://ossci-raw-job-status.s3.amazonaws.com/log/15968424899) in the [torchinductor hf benchmarks](https://hud.pytorch.org/benchmark/huggingface/inductor_aot_inductor?startTime=Thu,%2010%20Aug%202023%2018:05:47%20GMT&stopTime=Thu,%2017%20Aug%202023%2018:05:47%20GMT&granularity=hour&mode=inference&dtype=bfloat16&lBranch=main&lCommit=384e0d104fd077d31efafc564129660e9b7a0f25&rBranch=main&rCommit=03414081ff7ee011e17ee10f9ddb2584811bf965) should be fixed in the most recent release (for example, this [line](https://github.com/huggingface/transformers/blame/c036c814f427415db15d37fca98540d55abea492/src/transformers/models/opt/modeling_opt.py#L688) no longer exists). Additionally, I landed a [commit (6c26faa)](https://github.com/huggingface/transformers/commit/6c26faa159b79a42d7fa46cb66e2d21523351987) to the HF transformers repro to fix one of the graph breaks. This PR results in [76% pass rate for the export + aot inductor HF benchmark!](https://hud.pytorch.org/benchmark/compilers?startTime=Thu%2C%2010%20Aug%202023%2022%3A45%3A09%20GMT&stopTime=Thu%2C%2017%20Aug%202023%2022%3A45%3A09%20GMT&granularity=hour&suite=torchbench&mode=inference&dtype=bfloat16&lBranch=angelayi/hf_version&lCommit=0accaaca2fa70ca2f78c1a587dd4b6750448dd90&rBranch=main&rCommit=03414081ff7ee011e17ee10f9ddb2584811bf965)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/107400
Approved by: https://github.com/ezyang, https://github.com/desertfire, https://github.com/malfet
