[llvm] [InstCombine] Remove some of the complexity-based canonicalization (PR #91185)

[via llvm-commits]

goldsteinn wrote:

> > am I reading it right that you had no diff in your benchmarks? That seems surprising...
> 
> No. I just canceled the run as I thought it would produce tons of diff :(

I see (another case for: https://github.com/dtcxzyw/llvm-opt-benchmark/pull/355). Can you run it? Ill try and get `-stats` to work locally and post them here.

https://github.com/llvm/llvm-project/pull/91185