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Summary: This silences the two -Wimplicit-fallthrough warnings clang finds in ItaniumDemangle.h in libc++abi. Clang does not have a GNU attribute spelling for this attribute, so this is necessary. I will commit the same change to the LLVM demangler soon. Reviewers: EricWF, ldionne Subscribers: christof, erik.pilkington, cfe-commits Differential Revision: https://reviews.llvm.org/D53985 llvm-svn: 345870