[dynamo][guards] Use lambda guards for object aliasing to improve object aliasing guards

[anijain2305]

Stack from ghstack (oldest at bottom):

• [dynamo] Turn on recursive dict tag optimization #159186

• [dynamo][guards] Recursive dict tag optimization #159183

• [dynamo][guards] More small guard optimizations #159345

• -> [dynamo][guards] Use lambda guards for object aliasing to improve object aliasing guards #159288

    # Note - On Lambda guarding of object aliasing
    # We previously installed object‑aliasing guards as relational guards,
    # but that undermined the recursive‑dict guard optimization: placing the
    # aliasing guard at a leaf prevented the parent dict node from
    # qualifying as a recursive‑dict guard root. Because aliasing guards are
    # rare, we now emit them as epilogue guards via a small Python lambda.
    # This repeats the access in Python—adding a bit of work—but the
    # overhead is outweighed by the gains from enabling recursive‑dict guard
    # optimization.
  

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @chenyang78 @kadeng @chauhang @amjames @Lucaskabela

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit feb207a with merge base 3bf41f2 ():

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / linux-jammy-py3_9-clang9-xla / test (xla, 1, 1, linux.12xlarge, unstable) (gh) (#158876)
  sccache: error: couldn't connect to server

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[pytorchmergebot]

Starting merge as part of PR stack under #159345