Refactor: move method to func compilation work to compileMethod, add option to specify method name (#66726)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66726
Move method to func compilation work to compileMethod
Test Plan:
Mobilenetv3 compiles and runs successfully
```
(pytorch) ~/fbsource/fbcode/caffe2/fb/nnc
└─ $ buck run //caffe2/binaries:aot_model_compiler -- --model mobilenetv3.pt --model_name=pytorch_dev_mobilenetv3 --model_version=v1 --input_dims="1,3,224,224"
Downloaded 0/4 artifacts, 0.00 bytes, 100.0% cache miss (for updated rules)
Building: finished in 13.2 sec (100%) 18719/18719 jobs, 2/18719 updated
Total time: 13.5 sec
BUILD SUCCEEDED
The compiled llvm assembly code was saved to mobilenetv3.compiled.ll
The compiled model was saved to mobilenetv3.compiled.pt
```
Reviewed By: ljk53, IvanKobzarev
Differential Revision: D31624342
fbshipit-source-id: 233a6e94ea05ba8d6fc166d2414034c9e58cb076
