remove wipe cache from op bench (#31334)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31334
The wipe cache logic was introduced hoping to reduce the variations in the benchmark results. Based on our experiments result, it didn't actually help with that. In addition, several engineers had encountered the issue of missing cpuinfo.h which was used in the wipe cache logic. So this diff removes that feature to ensure smooth installation and running of the op bench.
Test Plan:
```
buck run caffe2/benchmarks/operator_benchmark/pt:add_test -- --iterations 1
# ----------------------------------------
# PyTorch/Caffe2 Operator Micro-benchmarks
# ----------------------------------------
# Tag : short
# Benchmarking PyTorch: add
# Mode: Eager
# Name: add_M1_N1_K1_cpu
# Input: M: 1, N: 1, K: 1, device: cpu
Forward Execution Time (us) : 111.192
A/B test also pass Benchmark Run #2476535015
Reviewed By: hl475
Differential Revision: D19126970
fbshipit-source-id: 9b1ab48c121838836ba6e0ae664a48fe2d18efdd
