[llvm] Revert "[AMDGPU] Enable scheduler mfma rewrite stage by default" (PR #185604)

[Jay Foad via llvm-commits]

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@@ -101,7 +101,7 @@ static cl::opt<bool> PrintMaxRPRegUsageAfterScheduler(
 
 static cl::opt<bool> DisableRewriteMFMAFormSchedStage(
     "amdgpu-disable-rewrite-mfma-form-sched-stage", cl::Hidden,
-    cl::desc("Disable rewrite mfma rewrite scheduling stage"), cl::init(false));
+    cl::desc("Disable rewrie mfma rewrite scheduling stage"), cl::init(true));
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jayfoad wrote:

```suggestion
    cl::desc("Disable rewrite mfma rewrite scheduling stage"), cl::init(true));
```

https://github.com/llvm/llvm-project/pull/185604