[llvm] [CodeGen] Combine two loops in SloIndexes.cpp file (PR #127631)

[Matt Arsenault via llvm-commits]

================
@@ -287,4 +295,4 @@ LLVM_DUMP_METHOD void SlotIndex::dump() const {
   print(dbgs());
   dbgs() << "\n";
 }
-#endif
+#endif
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arsenm wrote:

```suggestion
#endif

```

https://github.com/llvm/llvm-project/pull/127631