[llvm] [AMDGPU] Add stalls for DS FIFO buffer to coexec sched (PR #185726)

[Lucas Ramirez via llvm-commits]

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@@ -234,6 +264,11 @@ class HardwareUnitInfo {
   /// and reducing its \p BlockingCycles from the TotalCycles. This maintains
   /// the list of PrioritySUS.
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lucas-rami wrote:

```suggestion
  /// the list of PrioritySUs.
```

https://github.com/llvm/llvm-project/pull/185726