Use .gv instead of .dot for Graphviz in fast_nvcc (#53208)
Summary:
See this page for context: https://marc.info/?l=graphviz-devel&m=129418103126092
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53208
Test Plan:
```
tools/fast_nvcc/fast_nvcc.py --help
```
Reviewed By: janeyx99
Differential Revision: D26791398
Pulled By: samestep
fbshipit-source-id: 6a0363a4664e79b80ddf2ae799ec05ee7d028357
