Simplify nested Min and Max patterns. (#44142)
Summary:
Improve simplification of nested Min and Max patterns.
Specifically, handles the following pattern simplications:
* `Max(A, Max(A, Const)) => Max(A, Const)`
* `Max(Min(A, B), Min(A, C)) => Min(A, Max(B, C))`
* `Max(Const, Max(A, OtherConst) => Max(A, Max(Const, OtherConst))`
- This case can have an arbitrarily long chain of Max ops. For example: `Max(5, Max(x, Max(y, Max(z, 8)))) => Max(Max(Max(x, 8), y), z)`
Similarly, for the case of Min as well.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44142
Reviewed By: albanD
Differential Revision: D23644486
Pulled By: navahgar
fbshipit-source-id: 42bd241e6c2af820566744c8494e5dee172107f4
