[clang] [Parser][NFC] Move the core parsing of an attribute into a separate method (PR #107300)

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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 34f2c9a9ce73a61b27d75dab7e1eed256491afcc c30c6c11686cc95ba20eb7000d210b17757fbfe3 --extensions cpp,h -- clang/include/clang/Parse/Parser.h clang/lib/Parse/ParseDecl.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/Parse/Parser.h b/clang/include/clang/Parse/Parser.h
index 895f043607..bffe9919fd 100644
--- a/clang/include/clang/Parse/Parser.h
+++ b/clang/include/clang/Parse/Parser.h
@@ -2943,8 +2943,7 @@ private:
     return false;
   }
 
-  bool ParseGNUSingleAttribute(ParsedAttributes &Attrs,
-                               SourceLocation &EndLoc,
+  bool ParseGNUSingleAttribute(ParsedAttributes &Attrs, SourceLocation &EndLoc,
                                LateParsedAttrList *LateAttrs = nullptr,
                                Declarator *D = nullptr);
   void ParseGNUAttributes(ParsedAttributes &Attrs,

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https://github.com/llvm/llvm-project/pull/107300