[llvm] [ScheduleDAG] Allow disabling the SchedModel / Itineraries during Scheduling (PR #138057)

[Matt Arsenault via llvm-commits]

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@@ -69,6 +69,10 @@ static cl::opt<bool>
 static cl::opt<bool> UseTBAA("use-tbaa-in-sched-mi", cl::Hidden,
     cl::init(true), cl::desc("Enable use of TBAA during MI DAG construction"));
 
+static cl::opt<bool> DisableSchedModel(
+    "disable-schedmodel-in-sched-mi", cl::Hidden, cl::init(false),
+    cl::desc("Enable use of TBAA during MI DAG construction"));
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arsenm wrote:

Description doesn't match 

https://github.com/llvm/llvm-project/pull/138057