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27c4777f41
llvm-symbolizer echoed input if it was not recognized as a valid address. This behavior was extended to llvm-addr2line as well. GNU addr2line in this case optputs "??:0". This difference prevents implementation of symbol+offset lookup available in the recent versions of GNU binutils. In that case a string that is not an address may be a symbol. This change make reaction of llvm-addr2line on unrecognized input closer to GNU addr2line.