Use non-temporal stores where possible in weight packing kernels. #8865
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I've also added an assertion for the correct packed weights pointer alignment. This is _not_ a new constraint since the replaced `xnn_store_s32` and `_mm(256|512)?_store_.*` instructions already had the same alignment requirements. PiperOrigin-RevId: 805224577
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Use non-temporal stores where possible in weight packing kernels.
I've also added an assertion for the correct packed weights pointer alignment. This is not a new constraint since the replaced
xnn_store_s32and_mm(256|512)?_store_.*instructions already had the same alignment requirements.