[llvm] Fix compiler errors in GVN.h for clang versions older than 15 (PR #107636)

[via llvm-commits]

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff 7f77db4ffca9b275b40e8720208a03dd6cbc390e 946d770d6b9d8917fa4e5ffbaef89c2cedaabb94 --extensions h -- llvm/include/llvm/Support/Compiler.h llvm/include/llvm/Transforms/Scalar/GVN.h
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/include/llvm/Transforms/Scalar/GVN.h b/llvm/include/llvm/Transforms/Scalar/GVN.h
index be6c0ec5ed..e6adb183ff 100644
--- a/llvm/include/llvm/Transforms/Scalar/GVN.h
+++ b/llvm/include/llvm/Transforms/Scalar/GVN.h
@@ -62,7 +62,7 @@ struct AvailableValue;
 struct AvailableValueInBlock;
 class GVNLegacyPass;
 
-} // end namespace gvn
+} // namespace LLVM_LIBRARY_VISIBILITY_NAMESPACE gvn
 
 /// A set of parameters to control various transforms performed by GVN pass.
 //  Each of the optional boolean parameters can be set to:

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https://github.com/llvm/llvm-project/pull/107636