[llvm] [RISCV] Don't select sh{1, 2, 3}add if shl doesn't have one use (PR #143351)

[Min-Yih Hsu via llvm-commits]

https://github.com/mshockwave commented:

@stefanp-synopsys do you have any comment on https://github.com/llvm/llvm-project/pull/130829#pullrequestreview-2730533158 ?

https://github.com/llvm/llvm-project/pull/143351