[llvm] [EarlyCSE] Support CSE for commutative intrinsics with over 2 args (PR #67255)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

I think this is missing a test where something other than the first two operands are commuted. E.g. fma(a, b, c) and fma(a, c, b).

https://github.com/llvm/llvm-project/pull/67255