[TIR] Decouple DeepEqual from StructuralEqual #18151
Merged
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This PR decouples deep equal from structural equal implementation by providing a more direct implementatio through functor.
DeepEqual is being used at heart of arith simplification as subroutine and it performs more direct nested checking without doing var remapping as structural equal for efficiency reasons. It also do not need to trace the wrong comparison since the failed path is also expected to happen often.
This step likely will improve the deep equal efficiency because of the more direct approach and gives us opportunity to run simplify future refactor of structural equal to focus on struct path tracing.