[dynamo] Remove unintended lru_cache (pytorch#147147)

I forgot to remove it while add frozenset __contains__ method in this PR
- pytorch#146062

This is causing memory leak

Fixes #ISSUE_NUMBER

Pull Request resolved: pytorch#147147
Approved by: https://github.com/williamwen42

Author: anijain2305

torch/_dynamo/variables/functions.py

@@ -390,7 +390,6 @@ def __init__(self, fn, is_constant=False, **kwargs) -> None:
         self.fn = fn
 
     @staticmethod
-    @functools.lru_cache(None)
     def is_supported_builtin_method(obj):
         method_self = obj.__self__
         method_name = obj.__name__