add more operators to benchmark_all_test (#28968)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/28968
Add fill and as_strided operators.
Test Plan:
```
buck run mode/opt //caffe2/benchmarks/operator_benchmark:benchmark_all_test -- --list_ops
# ----------------------------------------
# PyTorch/Caffe2 Operator Micro-benchmarks
# ----------------------------------------
# Tag : short
# List of Operators to run:
# round_
# exponential_
# QLinear
...
Reviewed By: hl475
Differential Revision: D18241522
fbshipit-source-id: aade1d68a68a660d19d8dfd980eb4d5d0891488b
