[release/2.14] UT failure: test_autocast_sdpa_dynamic_shapes - torch._dynamo.exc.InternalTorchDynamoError: NotEqualError (ShapeEnv not equal)

Split from #4825.

Cases:
op_ut,test.dynamo.test_dynamic_shapes.DynamicShapesCtxManagerTests,test_autocast_sdpa_dynamic_shapes

## ErrorLog
```
________ DynamicShapesCtxManagerTests.test_autocast_sdpa_dynamic_shapes ________
[gw3] linux -- Python 3.10.20 /tmp/xpu-tool/Python/3.10.20/x64/bin/python
Traceback (most recent call last):
File "/__w/torch-xpu-ops/torch-xpu-ops/pytorch/test/dynamo/test_ctx_manager.py", line 316, in test_autocast_sdpa
compiled = opt_mod(query, key, value)
...
File "/tmp/xpu-tool/Python/3.10.20/x64/lib/python3.10/site-packages/torch/fx/experimental/recording.py", line 535, in shape_env_check_state_equal
raise NotEqualError("field values do not match:", errors)
torch._dynamo.exc.InternalTorchDynamoError: NotEqualError: ShapeEnv not equal: field values do not match:

==> guards: values do not match.
> Left: [s83 <= 576, (FloatTrueDiv(1.0, FloatPow(ToFloat(s83), 0.5))) >= 0.0, (FloatTrueDiv(1.0, FloatPow(ToFloat(s83), 0.5))) >= 0.0]
> Right: [s83 <= 576, (FloatTrueDiv(1.0, FloatPow(ToFloat(s83), 0.5))) >= 0.0, (FloatTrueDiv(1.0, FloatPow(ToFloat(s83), 0.5))) >= 0.0, (FloatTrueDiv(1.0, FloatPow(ToFloat(s83), 0.5))) >= 0.0]
```

## Pytorch Version
71b66af50dd18422e9ed558d83e3582d14aa1639

Read test/dynamo/test_ctx_manager.py around line 316 and run DynamicShapesCtxManagerTests.test_autocast_sdpa_dynamic_shapes to reproduce the failure. Trace the ShapeEnv state reported by the error and confirm the test completes without the NotEqualError.

Written by the indexing model from the issue text.