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With this patch, the copies of the files ItaniumDemangle.h, StringView.h, and Utility.h are kept byte-for-byte in sync between libcxxabi and llvm. All differences (namespaces, fallthrough, and unreachable macros) are defined in each copies' DemanglerConfig.h. This patch also adds a script to copy changes from libcxxabi (cp-to-llvm.sh), and a README.txt explaining the situation. Differential revision: https://reviews.llvm.org/D53538 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351474 91177308-0d34-0410-b5e6-96231b3b80d8