[llvm] [DebugInfo] Add Verifier check for duplicate arg indices in SP's retainedNodes list (PR #186225)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/IR/Verifier.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index f794fa29c..a4c91b741 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -1662,8 +1662,10 @@ void Verifier::visitDISubprogram(const DISubprogram &N) {
         continue;
       if (unsigned ArgNum = DV->getArg()) {
         auto [ArgI, Inserted] = Args.insert({ArgNum, DV});
-        CheckDI(Inserted || DV == ArgI->second, "invalid retained nodes, more than one local variable with the same argument index",
-            &N, N.getUnit(), Node, RetainedNode, Args[ArgNum]);
+        CheckDI(Inserted || DV == ArgI->second,
+                "invalid retained nodes, more than one local variable with the "
+                "same argument index",
+                &N, N.getUnit(), Node, RetainedNode, Args[ArgNum]);
       }
     }
   }

``````````

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https://github.com/llvm/llvm-project/pull/186225