[clang] [Serialization] [ASTWriter] Try to not record namespace as much as possible (PR #179178)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h,cppm -- clang/test/Modules/no-transitive-change-namespace.cppm clang/test/Modules/pr184957.cppm clang/include/clang/Serialization/ASTWriter.h clang/lib/Serialization/ASTWriter.cpp clang/lib/Serialization/ASTWriterDecl.cpp clang/test/Modules/no-transitive-decl-change-4.cppm --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/ASTWriterDecl.cpp b/clang/lib/Serialization/ASTWriterDecl.cpp
index d2fb6f9e8..62c6353a3 100644
--- a/clang/lib/Serialization/ASTWriterDecl.cpp
+++ b/clang/lib/Serialization/ASTWriterDecl.cpp
@@ -2239,7 +2239,7 @@ void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
         // We try to avoid touching every redeclaration to try to
         // reduce the dependencies as much as possible.
         if (!isa<NamespaceDecl>(DAsT))
-          AddFirstDeclFromEachModule(DAsT, /*IncludeLocal=*/ false);
+          AddFirstDeclFromEachModule(DAsT, /*IncludeLocal=*/false);
         else
           Record.AddDeclRef(/*Decl=*/nullptr);
       }

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https://github.com/llvm/llvm-project/pull/179178