[llvm] [LICM] Fold associative binary ops to promote code hoisting (PR #81608)

[Ricardo Jesus via llvm-commits]

rj-jesus wrote:

@sjoerdmeijer 
> The idea makes sense, and the implementation looks good to me too.
> But please wait a couple of days to give other reviewers a last chance to look at this; please merge early next week if there are no further comments;

Thanks, I will do!
> And please have a look at the formatting and other pre-merge checks that failed.

Thanks, I've addressed the formatting check, and I believe the other checks that failed were unrelated to this change and have disappeared with the most recent commit.

https://github.com/llvm/llvm-project/pull/81608