Fix import of instruction count benchmark (#85359)
This PR fixes the instruction count benchmark
1. Fix the updated import path
2. Allows building the benchmark with less compiler options (remove all "-W" options)
Test plan:
```
BENCHMARK_USE_DEV_SHM=1 python main.py --mode ci
```
Manually tested and worked on the CI machine.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/85359
Approved by: https://github.com/robieta
