Compute the feature_weights - input matmul to the scratch array, so matmul can work with stride of 1.
Compute the feature_weights - input matmul to the scratch array, so matmul can work with stride of 1.

Stride of 1 has better vectorized code in MatrixBatchVectorMultiplyAccumulate.

PiperOrigin-RevId: 298943089
Change-Id: Ic9a1495cd8316c869b5ec9f2d626b16085272670

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