[XLA:GPU] Emit matrix-vector multiplication as GemmFusion
[XLA:GPU] Emit matrix-vector multiplication as GemmFusion

Reverts b55d4f19569e850cb11f27de8f7596a7bb6046d5

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/13302 from openxla:fix_verifier_logging d174aac56c56bc61a146aafcb0c83e16a8154d06
