[clang] [NFC][clang] Don't sort sections (PR #162166)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/Basic/Diagnostic.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Basic/Diagnostic.cpp b/clang/lib/Basic/Diagnostic.cpp
index 0a261cac7..2b89370a4 100644
--- a/clang/lib/Basic/Diagnostic.cpp
+++ b/clang/lib/Basic/Diagnostic.cpp
@@ -538,11 +538,11 @@ WarningsSpecialCaseList::create(const llvm::MemoryBuffer &Input,
 
 void WarningsSpecialCaseList::processSections(DiagnosticsEngine &Diags) {
   static constexpr auto WarningFlavor = clang::diag::Flavor::WarningOrError;
-  for (const auto& SectionEntry : Sections) {
+  for (const auto &SectionEntry : Sections) {
     StringRef DiagGroup = SectionEntry.SectionStr;
     if (DiagGroup == "*") {
-      // Drop the default section introduced by special case list, we only support
-      // exact diagnostic group names.
+      // Drop the default section introduced by special case list, we only
+      // support exact diagnostic group names.
       // FIXME: We should make this configurable in the parser instead.
       continue;
     }

``````````

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https://github.com/llvm/llvm-project/pull/162166