[JIT] Skip builtins while enumerating class methods (#91805)
This is needed to support `enum.Enum` derived classes in Python-3.11
that adds `_new_member_` to classdict, see:
https://github.com/python/cpython/blob/15c44789bb125b93e96815a336ec73423c47508e/Lib/enum.py#L529
Following snippet illustrates the problem with the previous iteration of
the code on 3.11:
```python
from enum import Enum
import inspect
class Color(Enum):
RED = 1
GREEN = 2
def print_routines(cls):
print(cls.__name__)
for name in cls.__dict__:
fn = getattr(cls, name)
if inspect.isroutine(fn):
print(name, fn, f"has_globals: {hasattr(fn, '__globals__')}")
print_routines(Color)
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91805
Approved by: https://github.com/albanD, https://github.com/suo
