[ir] Improve ExternalTensorShapeAlongAxisStmt IR print result (#2665)
[ir] Improve ExternalTensorShapeAlongAxisStmt IR print result (#2665)

* [ir] Improve ExternalTensorShapeAlongAxisStmt IR print

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Co-authored-by: Taichi Gardener <52844ac7498fba84f633481a7c3ae54491811c81@gmail.com>
yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi