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97ff2dd1 - Fix GuardOnDataDependentSymNode UserError to preserve original exception (#176016)

Fix GuardOnDataDependentSymNode UserError to preserve original exception (#176016) Summary: Fixes #111075. When exporting, the branch that handles `GuardOnDataDependentSymNode` raised a new `UserError` without chaining the original exception. This could hide the underlying cause. This PR updates that branch in `torch/_dynamo/utils.py` to use `raise UserError(... ) from cause`, so the original exception is preserved while still surfacing the user-friendly error. X-link: https://github.com/pytorch/pytorch/pull/176016 Approved by: https://github.com/Lucaskabela Reviewed By: huydhn Differential Revision: D96281675 fbshipit-source-id: c7f9edf87c352a47cf0f25619ff3ece23ca75b32