Revert "Redefine the simdlen semantic: (#88482)"
This reverts commit fce6d6b3dcc879720bc45143426b86232106818a.
Reverted https://github.com/pytorch/pytorch/pull/88482 on behalf of https://github.com/kit1980 due to Broke multiple tests in several trunk workflows, for example https://github.com/pytorch/pytorch/actions/runs/3485086792/jobs/5830429554
