Tutorial on fuzzing and sanitizers
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 1. tut1: afl
 2. tut2: libfuzzer

* Refs
 - http://lcamtuf.coredump.cx/afl/
 - https://github.com/google/sanitizers
 - https://fuzzing-project.org/
 - https://github.com/google/fuzzer-test-suite
 - https://llvm.org/docs/LibFuzzer.html
 - https://en.wikipedia.org/wiki/Heartbleed
 - https://github.com/google/fuzzer-test-suite/blob/master/tutorial/libFuzzerTutorial.md