[llvm] [NFC][TableGen] Code cleanup in CodeGenRegister (PR #137994)

[Jason Eckhardt via llvm-commits]

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@@ -2221,20 +2209,21 @@ void CodeGenRegBank::computeRegUnitSets() {
     if (RCRegUnits.empty())
       continue;
 
-    LLVM_DEBUG(dbgs() << "RC " << RC.getName() << " Units:\n";
-               for (auto U
-                    : RCRegUnits) printRegUnitName(U);
-               dbgs() << "\n  UnitSetIDs:");
+    LLVM_DEBUG({
+      dbgs() << "RC " << RC.getName() << " Units:\n";
+      for (auto U : RCRegUnits)
+        printRegUnitName(U);
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nvjle wrote:

Use `formatv` or `llvm::interleaved` to eliminate loop? 
But if this stays as is, don't "always auto".

https://github.com/llvm/llvm-project/pull/137994