[clang] [clang] Fix a dangling reference in clang/utils/TableGen/ClangDiagnosticsEmitter.cpp (PR #119197)

[Haojian Wu via cfe-commits]

================
@@ -1908,7 +1908,7 @@ void clang::EmitClangDiagDocs(const RecordKeeper 
&Records, raw_ostream &OS) {
   for (const Record *G : DiagGroups) {
     bool IsRemarkGroup = isRemarkGroup(G, DiagsInGroup);
     auto &GroupInfo =
-        DiagsInGroup[std::string(G->getValueAsString("GroupName"))];
----------------
hokein wrote:

Interesting, there is a recent commit which changes the `map<std::string, ...>` 
to `map<llvm::StringRef, ...>`, 
https://github.com/llvm/llvm-project/commit/17c6ec6db1430e7e00c0e2a2ad6d26fa94fe8cf1
 , which leads to this dangling reference, cc @jurahul

If we want to change to StringMap, I think it is a separate change.




https://github.com/llvm/llvm-project/pull/119197
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