Implement deferring `stablehlo.transpose` ops attached to activations of `stablehlo.add`.
Implement deferring `stablehlo.transpose` ops attached to activations of `stablehlo.add`.

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/10626 from Intel-tensorflow:akhil/bf16_softmax d030100ea87923582aa64cdcf0fac1464051288c
