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Merge #18739: doc: Document how to fuzz Bitcoin Core using Honggfuzz

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bb1ec36fb1 doc: Document how to fuzz Bitcoin Core using honggfuzz (practicalswift)

Pull request description:

  Document how to fuzz Bitcoin Core using Honggfuzz.

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  fanquake:
    ACK bb1ec36fb1 - did a couple quick runs on a severely under powered VM.

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@ -133,3 +133,25 @@ $ afl/afl-fuzz -i inputs/ -o outputs/ -- src/test/fuzz/bech32
```
Read the [`afl-fuzz` documentation](https://github.com/google/afl) for more information.
# Fuzzing Bitcoin Core using Honggfuzz
## Quickstart guide
To quickly get started fuzzing Bitcoin Core using [Honggfuzz](https://github.com/google/honggfuzz):
```sh
$ git clone https://github.com/bitcoin/bitcoin
$ cd bitcoin/
$ ./autogen.sh
$ git clone https://github.com/google/honggfuzz
$ cd honggfuzz/
$ make
$ cd ..
$ CC=$(pwd)/honggfuzz/hfuzz_cc/hfuzz-clang CXX=$(pwd)/honggfuzz/hfuzz_cc/hfuzz-clang++ ./configure --enable-fuzz --with-sanitizers=address,undefined
$ make
$ mkdir -p inputs/
$ honggfuzz/honggfuzz -i inputs/ -- src/test/fuzz/process_message
```
Read the [Honggfuzz documentation](https://github.com/google/honggfuzz/blob/master/docs/USAGE.md) for more information.