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

[Lucas Ramirez via llvm-commits]

================
@@ -408,10 +411,15 @@ AMDGPUCoExecSchedStrategy::AMDGPUCoExecSchedStrategy(
     const MachineSchedContext *C)
     : GCNSchedStrategy(C) {
   SchedStages.push_back(GCNSchedStageID::ILPInitialSchedule);
+  SchedStages.push_back(GCNSchedStageID::LiveIntervalRPReschedule);
   SchedStages.push_back(GCNSchedStageID::RewriteMFMAForm);
   SchedStages.push_back(GCNSchedStageID::PreRARematerialize);
   // Use more accurate GCN pressure trackers.
   UseGCNTrackers = true;
+
+  if (!VGPRThresholdPercentOpt.getNumOccurrences()) {
+    VGPRThresholdPercent = DefaultCoExecVGPRThresholdPercent;
+  }
----------------
lucas-rami wrote:

```suggestion
  if (!VGPRThresholdPercentOpt.getNumOccurrences())
    VGPRThresholdPercent = DefaultCoExecVGPRThresholdPercent;
```

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