Enable using `torch.autograd.profiler.record_function` as decorator (#30861)
Summary:
```python
record_function('my_func')
def f(x, y):
return x + y
with profile() as p:
f(1, 2)
print(prof.key_averages().table())
```
```
------------------------------------ --------------- --------------- --------------- --------------- --------------- ---------------
Name Self CPU total % Self CPU total CPU total % CPU total CPU time avg Number of Calls
------------------------------------ --------------- --------------- --------------- --------------- --------------- ---------------
my_func 85.42% 86.796us 87.27% 88.670us 88.670us 1
------------------------------------ --------------- --------------- --------------- --------------- --------------- ---------------
Self CPU time total: 101.606us
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30861
Differential Revision: D18857993
Pulled By: bddppq
fbshipit-source-id: eb6b8e2a8d4f3a7f8e5b4cb3da1ee3320acb1ae7
