dynamo tracing perf: Guard slots: 51.76 -> 51.34 (#143060)

See #143056 for overall docs.

This PR: Add slots to Guard
Pull Request resolved: https://github.com/pytorch/pytorch/pull/143060
Approved by: https://github.com/jansel
ghstack dependencies: #143066, #143056, #143058, #143059

torch/_guards.py

@@ -28,6 +28,7 @@ from typing import (
 )
 
 from torch.utils import _pytree as pytree
+from torch.utils._backport_slots import dataclass_slots
 from torch.utils._traceback import CapturedTraceback, format_frame
 from torch.utils.weak import WeakTensorKeyDictionary
 
@@ -169,6 +170,7 @@ class ShapeGuard(NamedTuple):
     sloc: SLoc
 
 
+@dataclass_slots
 @dataclasses.dataclass
 class Guard:
     # originating_source is the source that called the make_guard method to