[llvm] [MISched] Small debug improvements (PR #125072)

[Matt Arsenault via llvm-commits]

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@@ -1316,11 +1316,11 @@ void ScheduleDAGMILive::initRegPressure() {
       RegionCriticalPSets.push_back(PressureChange(i));
     }
   }
-  LLVM_DEBUG(dbgs() << "Excess PSets: ";
-             for (const PressureChange &RCPS
-                  : RegionCriticalPSets) dbgs()
-             << TRI->getRegPressureSetName(RCPS.getPSet()) << " ";
-             dbgs() << "\n");
+  if (RegionCriticalPSets.size() > 0)
+    LLVM_DEBUG(dbgs() << "Excess PSets: ";
+               for (const PressureChange &RCPS : RegionCriticalPSets) dbgs()
+               << TRI->getRegPressureSetName(RCPS.getPSet()) << " ";
+               dbgs() << "\n");
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arsenm wrote:

clang-format really botched this formatting. Does adding some braces help? 

https://github.com/llvm/llvm-project/pull/125072