[llvm] [Spiller] Detach legacy pass and supply analyses instead (PR #122665)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> This relands https://github.com/llvm/llvm-project/commit/a531800344dc54e9c197a13b22e013f919f3f5e1

You should use git revert to get the correct generated message with reapply 

https://github.com/llvm/llvm-project/pull/122665