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This improves the performance of unwinding on DWARF based targets. The 32-bit x86 support for scanning the full eh_frame (CFI_Parser::findFDE) apparently does not work (at least not on Linux). Since the eh_frame_hdr code delegates to that, this still doesn't work for x86 Linux, but it has been tested on x86_64 Linux and aarch64 Android. llvm-svn: 230802