Fixed/added namespace ending comments using clang-tidy. NFC

The patch is generated using this command:

  $ tools/extra/clang-tidy/tool/run-clang-tidy.py -fix \
      -checks=-*,llvm-namespace-comment -header-filter='llvm/.*|clang/.*' \
      work/llvm/tools/clang

To reduce churn, not touching namespaces spanning less than 10 lines.

llvm-svn: 240270
diff --git a/clang/lib/CodeGen/CGExprCXX.cpp b/clang/lib/CodeGen/CGExprCXX.cpp
index f0f706d..d3a4fd2 100644
--- a/clang/lib/CodeGen/CGExprCXX.cpp
+++ b/clang/lib/CodeGen/CGExprCXX.cpp
@@ -1213,7 +1213,7 @@
       EmitNewDeleteCall(CGF, OperatorDelete, FPT, DeleteArgs);
     }
   };
-}
+} // namespace
 
 /// Enter a cleanup to call 'operator delete' if the initializer in a
 /// new-expression throws.
@@ -1437,7 +1437,7 @@
       CGF.EmitDeleteCall(OperatorDelete, Ptr, ElementType);
     }
   };
-}
+} // namespace
 
 void
 CodeGenFunction::pushCallObjectDeleteCleanup(const FunctionDecl *OperatorDelete,
@@ -1564,7 +1564,7 @@
       EmitNewDeleteCall(CGF, OperatorDelete, DeleteFTy, Args);
     }
   };
-}
+} // namespace
 
 /// Emit the code for deleting an array of objects.
 static void EmitArrayDelete(CodeGenFunction &CGF,