Fix bfloat16 erfinv get incorrect value problem for cpu path (#43399)
Summary:
Fix https://github.com/pytorch/pytorch/issues/43344
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43399
Reviewed By: albanD
Differential Revision: D23264789
Pulled By: pbelevich
fbshipit-source-id: 8b77c0f6ca44346e44599844fb1e172fdbd9df6c
