Only do so if we don't create more instructions, so either both rotates have one use or one of the rotates has one use and both `A0` and `A1` are constant. Proof: https://alive2.llvm.org/ce/z/tpAoCW

We canonicalize rotate-right -> rotate-left in other places. Makes sense to do so here as well. Proof: https://alive2.llvm.org/ce/z/HL3TpK

Only do so if we don't create more instructions,We canonicalize rotate-right -> rotate-left in other places. so either bothMakes rotates have one use or one of the rotates has one use and both `A0`sense to do so here as well. and `A1` are constant. Proof: https://alive2.llvm.org/ce/z/tpAoCWHL3TpK