reduce computation of batch_norm when weight or bias is none

[XiaobingSuper]

Stack from ghstack (oldest at bottom):

• -> reduce computation of batch_norm when weight or bias is none #104616

For batch_norm decomposition, if weight or bias is None, we can skip some computations for better performance.

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[lezcano]

Nice catch!

[XiaobingSuper]

@pytorchbot merge

[pytorchmergebot]

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[XiaobingSuper]

@pytorchbot merge

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