[HIPIFY][clang][compatibility][fix] clang 21.0.0git compatibility fix
#1974
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[Root Cause] + [LLVM][#139584](https://github.com/llvm/llvm-project/pull/139584)[clang] Remove intrusive reference count from `DiagnosticOptions` [IMP] + `LLVM < 21` is also supported, but `LLVM 21` should be newer than [671cd5acb49f9fae274f66cd71464d4afed914e3](llvm/llvm-project@671cd5a) (2025-05-20) to build `hipify-clang` correctly [Note] + Unfortunately, the class `DiagnosticsEngine` has assignment operator and copy ctor both marked as `delete`, thus the compatibility patch can't be implemented as a separate function in the `llcompat` namespace
emankov
added
fix
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[Root Cause]
DiagnosticOptions[IMP]
LLVM < 21is also supported, butLLVM 21should be newer than 671cd5acb49f9fae274f66cd71464d4afed914e3 (2025-05-20) to buildhipify-clangcorrectly[Note]
DiagnosticsEnginehas assignment operator and copy ctor both marked asdelete, thus the compatibility patch can't be implemented as a separate function in thellcompatnamespace