Currently reassociating add expressions can lead to failing to select
(u|s)mlal. Implement isReassocProfitable to skip reassociating
expressions that can be lowered to (u|s)mlal.
The same issue exists for the *mlsl variants as well, but the DAG
combiner doesn't use the isReassocProfitable hook before reassociating.
To be fixed in a follow-up commit as this requires DAGCombiner changes