Improve conv2d backward pass performance #183512

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Lint — success (1m 12s)
O
pull / linux-jammy-py3.8-gcc11 / build — success (8m 32s)
O
pull / linux-jammy-py3.8-gcc11 / test — success (22m 14s)
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pull / linux-focal-cuda12.1 / build — success (12m 3s)
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pull / linux-focal-cuda12.1 / test — failure FAIL test_sparse (SparseTestCUDA) Duration: 45m 12s
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