Log Message:
Update to 1.64b:

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Version 1.64b:
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  - Further simplified afl-clang-fast runtime by reverting .init_array to
    __attribute__((constructor(0)). This should improve compatibility with
    non-ELF platforms.

  - Fixed a problem with afl-clang-fast and -shared libraries. Simplified
    the code by getting rid of .preinit_array and replacing it with a .comm
    object. Problem reported by Charlie Eriksen.

  - Removed unnecessary instrumentation density adjustment for the LLVM mode.
    Reported by Jonathan Neuschafer.

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Version 1.63b:
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  - Updated cgroups_asan/ with a new version from Sam, made a couple changes
    to streamline it and keep parallel afl instances in separate groups.

  - Fixed typos, thanks to Jakub Wilk.

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Version 1.62b:
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  - Improved the handling of -x in afl-clang-fast,

  - Improved the handling of low AFL_INST_RATIO settings for QEMU and
    LLVM modes.

  - Fixed the llvm-config bug for good (thanks to Tobias Ospelt).

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Version 1.61b:
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  - Fixed an obscure bug compiling OpenSSL with afl-clang-fast. Patch by
    Laszlo Szekeres.

  - Fixed a 'make install' bug on non-x86 systems, thanks to Tobias Ospelt.

  - Fixed a problem with half-broken llvm-config on Odroid, thanks to
    Tobias Ospelt. (There is another odd bug there that hasn't been fully
    fixed - TBD).

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Version 1.60b:
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  - Allowed experimental/llvm_instrumentation/ to graduate to llvm_mode/.

  - Removed experimental/arm_support/, since it's completely broken and likely
    unnecessary with LLVM support in place.

  - Added ASAN cgroups script to experimental/asan_cgroups/, updated existing
    docs. Courtesy Sam Hakim and David A. Wheeler.

  - Refactored afl-tmin to reduce the number of execs in common use cases.
    Ideas from Jonathan Neuschafer and Turo Lamminen.

  - Added a note about CLAs at the bottom of README.

  - Renamed testcases_readme.txt to README.testcases for some semblance of
    consistency.

  - Made assorted updates to docs.

  - Added MEM_BARRIER() to afl-showmap and afl-tmin, just t be safe.

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Version 1.59b:
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  - Imported Laszlo Szekeres' experimental LLVM instrumentation into
    experimental/llvm_instrumentation. I'll work on including it in the
    "mainstream" version soon.

  - Fixed another typo, thanks to Jakub Wilk.