Revert "inductor: promote half/bfloat16 constant to float for cpu vectorization path (#105440)"
This reverts commit 18bcf62bbcf7ffd47e3bcf2596f72aa07a07d65f.
Reverted https://github.com/pytorch/pytorch/pull/105440 on behalf of https://github.com/XiaobingSuper due to introduce core dumped when init bfloat16 zero tensor ([comment](https://github.com/pytorch/pytorch/pull/105440#issuecomment-1643079005))
