[clang] [NFC] [Serialization] Extract the functionality of merging decls from ASTReaderDecl (PR #103022)

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

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git-clang-format --diff 86ef9ee60015c582b14ecfaedda415e671578b4b 6e2903a427ef8d865a1d35ebb63402b5314d09a8 --extensions h,cpp -- clang/include/clang/AST/DeclBase.h clang/include/clang/AST/DeclCXX.h clang/include/clang/AST/DeclObjC.h clang/include/clang/AST/Redeclarable.h clang/include/clang/Serialization/ASTReader.h clang/lib/Serialization/ASTReaderDecl.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp b/clang/lib/Serialization/ASTReaderDecl.cpp
index a9199f7e50..c51737c33f 100644
--- a/clang/lib/Serialization/ASTReaderDecl.cpp
+++ b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -474,9 +474,9 @@ public:
   void VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D);
   void VisitOMPRequiresDecl(OMPRequiresDecl *D);
   void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
-  };
+};
 
-  } // namespace clang
+} // namespace clang
 
 namespace {
 

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https://github.com/llvm/llvm-project/pull/103022