[clang] [C++20][Modules] Improve namespace look-up performance for modules. (PR #171769)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/Serialization/ASTReader.cpp clang/lib/Serialization/ASTWriter.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 3dbaa8dd5..05076d815 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -561,7 +561,7 @@ class DeclsSet {
   llvm::SmallPtrSet<NamedDecl *, 8> Found;
 
 public:
-  operator ArrayRef<NamedDecl*>() const { return Decls; }
+  operator ArrayRef<NamedDecl *>() const { return Decls; }
 
   bool empty() const { return Decls.empty(); }
 

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https://github.com/llvm/llvm-project/pull/171769