[llvm] [AMDGPU] Enable co-exec scheduler for gfx950. (PR #193713)

[Matt Arsenault via llvm-commits]

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@@ -410,6 +411,7 @@ AMDGPUCoExecSchedStrategy::AMDGPUCoExecSchedStrategy(
     const MachineSchedContext *C)
     : GCNSchedStrategy(C) {
   SchedStages.push_back(GCNSchedStageID::ILPInitialSchedule);
+  SchedStages.push_back(GCNSchedStageID::RewriteMFMAForm);
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arsenm wrote:

Not related to the title 

https://github.com/llvm/llvm-project/pull/193713