[llvm] [RISCV][WIP] Fold (sh3add Z, (add X, (slli Y, 6))) -> (sh3add (sh3add Y, Z), X). (PR #85734)

[Mikhail Gudim via llvm-commits]

mgudim wrote:

> Are you going to tackle it has reassociate in DAG combine?

Not sure yet.  I'll take a closer look and keep the variations you mentioned in mind.


https://github.com/llvm/llvm-project/pull/85734