Fix some clang-tidy namespace closing comments warnings. NFC.
diff --git a/llvm/lib/IR/PassManager.cpp b/llvm/lib/IR/PassManager.cpp
index a8aa1e1..624827f 100644
--- a/llvm/lib/IR/PassManager.cpp
+++ b/llvm/lib/IR/PassManager.cpp
@@ -89,7 +89,7 @@
   // Return false to indicate that this result is still a valid proxy.
   return false;
 }
-}
+} // namespace llvm
 
 AnalysisSetKey CFGAnalyses::SetKey;