[BF16] Add BF16 support to _aminmax and _anminmax_all operators (#62767)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62767
Add BF16 support to _aminmax_all and _aminmax operators.
Test Plan:
Added unit test:
https://www.internalfb.com/intern/testinfra/testconsole/testrun/2533274857208373/
Reviewed By: anjali411
Differential Revision: D30073837
fbshipit-source-id: 9cb4991e644cfdb2f0674ccaff161d223c174150
