[clang] [NFC][Clang] Use StringRef instead of string in ClangDiagnosticEmitter (PR #115959)

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github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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

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``````````bash
git-clang-format --diff 7b5e285d16090c2ddf4ee539c410d24bde52cbea cdcd09ec7c11a21da0804a6e886aff6410c42daf --extensions cpp -- clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp b/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
index 20b30261b7..9aab37514d 100644
--- a/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
+++ b/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
@@ -92,6 +92,7 @@ namespace {
     const RecordKeeper &Records;
     StringMap<unsigned> CategoryIDs;
     std::vector<StringRef> CategoryStrings;
+
   public:
     DiagCategoryIDMap(const RecordKeeper &records) : Records(records) {
       DiagGroupParentMap ParentInfo(Records);

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https://github.com/llvm/llvm-project/pull/115959