[llvm] [DAGCombiner][RISCV] Add target hook to decide hoisting LogicOp with extension (PR #136677)

[Luke Lau via llvm-commits]

https://github.com/lukel97 approved this pull request.

LGTM. I wonder if we should just add a pattern for disjoint ors rather than adding yet another target hook for DAGCombiner. But I think we can explore that in a follow up

https://github.com/llvm/llvm-project/pull/136677