Revert "[Inductor] GEMM shape padding improvements (#118522)"
This reverts commit cc46829f96dba05b9b46bae31a1e6d2a053f667e.
Reverted https://github.com/pytorch/pytorch/pull/118522 on behalf of https://github.com/eellison due to regresses HF ~4/5% ([comment](https://github.com/pytorch/pytorch/pull/118522#issuecomment-1932557670))
