[Sema] Fix MSVC "attribute is not recognized" warning (NFC)
MSVC warning: ``` \llvm-project\clang\lib\Sema\SemaChecking.cpp(10323): warning C5030: attribute 'clang::fallthrough' is not recognized ```
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MSVC warning: ``` \llvm-project\clang\lib\Sema\SemaChecking.cpp(10323): warning C5030: attribute 'clang::fallthrough' is not recognized ```