Fix NaN propagation in fuser's min/max implementation (#43590)
Summary:
fmax/fmin propagate the number if one argument is NaN, which doesn't match the eager mode behavior.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43590
Reviewed By: mruberry
Differential Revision: D23338664
Pulled By: bertmaher
fbshipit-source-id: b0316a6f01fcf8946ba77621efa18f339379b2d0
