[triton] Avoid propagating slice layouts across broadcast. #97350
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This can cause massive register pressure, and it's better to convert to blocked before the broadcast. The current state of RemoveLayoutConversion relies on slice layouts being pushed up in the second (hoisting) phase on top of broadcasts again, but this fails for the softmax pattern. PiperOrigin-RevId: 786179698
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[triton] Avoid propagating slice layouts across broadcast.
This can cause massive register pressure, and it's better to convert to blocked before the broadcast. The current state of RemoveLayoutConversion relies on slice layouts being pushed up in the second (hoisting) phase on top of broadcasts again, but this fails for the softmax pattern.