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Treat 8th bit of version value for llvm_linux platform as signed GOT flag. - clang: define `PointerAuthELFGOT` LangOption and set 8th bit of `aarch64-elf-pauthabi-version` LLVM module flag correspondingly; - llvm-readobj: print `PointerAuthELFGOT` or `!PointerAuthELFGOT` in version description of llvm_linux platform depending on whether the flag is set.