[EarlyCSE] recognize commuted and swapped variants of min/max as equivalent (PR35642)

As shown in:
https://bugs.llvm.org/show_bug.cgi?id=35642
...we can have different forms of min/max, so we should recognize those here in EarlyCSE 
similar to how we already handle binops and compares that can commute.

Differential Revision: https://reviews.llvm.org/D41136


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320640 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed