[llvm] [AMDGPU] RFC: Add and optionally use GCNIterativeRPTrackers (PR #88797)

[Jeffrey Byrnes via llvm-commits]

jrbyrnes wrote:

Closing in favor of the stack of PRs:

Create BBLiveOutMap using existing getLiveRegMap: https://github.com/llvm/llvm-project/pull/93089
Extend Current Trackers for External iterator: https://github.com/llvm/llvm-project/pull/93088
Scheduler changes necessary to use new trackers: https://github.com/llvm/llvm-project/pull/93090

https://github.com/llvm/llvm-project/pull/88797