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1841191f - add USER_ERROR graph break hint to some dynamic shapes errors, chain underlying exceptions (#172694)

add USER_ERROR graph break hint to some dynamic shapes errors, chain underlying exceptions (#172694) Summary: This is to improve error messages of Dynamo FX node failures, in particular: - we suggest the user to run their code in eager to see if the error occurs - we chain exceptions wherever we were missing them in torch/_dynamo/utils.py X-link: https://github.com/pytorch/pytorch/pull/172694 Approved by: https://github.com/pianpwk Reviewed By: izaitsevfb Differential Revision: D92237542 fbshipit-source-id: a627dc45275af5463928fe92bb9ec8c8ab1e6385