[llvm] [AMDGPU] Improved register pressure estimates for rescheduling (PR #213116)

[Romanov Vlad via llvm-commits]

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@@ -412,10 +415,14 @@ AMDGPUCoExecSchedStrategy::AMDGPUCoExecSchedStrategy(
     const MachineSchedContext *C)
     : GCNSchedStrategy(C) {
   SchedStages.push_back(GCNSchedStageID::ILPInitialSchedule);
+  SchedStages.push_back(GCNSchedStageID::LiveIntervalRPReschedule);
   SchedStages.push_back(GCNSchedStageID::RewriteMFMAForm);
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romanovvlad wrote:

We should probably schedule `LiveIntervalRPReschedule` after `RewriteMFMAForm` since `RewriteMFMAForm` can lower vgpr pressure.

https://github.com/llvm/llvm-project/pull/213116