[clang-tools-extra] [clang-doc][NFC] Introduce OwnedPtr abstraction (PR #184869)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang-tools-extra/clang-doc/BitcodeReader.cpp clang-tools-extra/clang-doc/BitcodeReader.h clang-tools-extra/clang-doc/Generators.cpp clang-tools-extra/clang-doc/Generators.h clang-tools-extra/clang-doc/HTMLGenerator.cpp clang-tools-extra/clang-doc/JSONGenerator.cpp clang-tools-extra/clang-doc/MDGenerator.cpp clang-tools-extra/clang-doc/MDMustacheGenerator.cpp clang-tools-extra/clang-doc/Mapper.cpp clang-tools-extra/clang-doc/Representation.cpp clang-tools-extra/clang-doc/Representation.h clang-tools-extra/clang-doc/Serialize.cpp clang-tools-extra/clang-doc/Serialize.h clang-tools-extra/clang-doc/YAMLGenerator.cpp clang-tools-extra/clang-doc/benchmarks/ClangDocBenchmark.cpp clang-tools-extra/clang-doc/tool/ClangDocMain.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-tools-extra/clang-doc/JSONGenerator.cpp b/clang-tools-extra/clang-doc/JSONGenerator.cpp
index 1b31cc065..29659a756 100644
--- a/clang-tools-extra/clang-doc/JSONGenerator.cpp
+++ b/clang-tools-extra/clang-doc/JSONGenerator.cpp
@@ -911,8 +911,7 @@ static Error serializeIndex(const ClangDocContext &CDCtx, StringRef RootDir,
   return Error::success();
 }
 
-static void serializeContexts(Info *I,
-                              StringMap<OwnedPtr<Info>> &Infos) {
+static void serializeContexts(Info *I, StringMap<OwnedPtr<Info>> &Infos) {
   if (I->USR == GlobalNamespaceID)
     return;
   auto ParentUSR = I->ParentUSR;

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https://github.com/llvm/llvm-project/pull/184869