[clang] [libcxx] [clang] Add -Wimplicit-fallthrough to -Wextra (PR #97926)

[Max Coplan via cfe-commits]

Max =?utf-8?b?8J+RqPCfj73igI3wn5K7?= Copl
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/97926 at github.com>


https://github.com/vegerot edited https://github.com/llvm/llvm-project/pull/97926