Add WasmBoy and WasmSynth

test/benchmark/wasmboy/.gitignore

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+.gb

test/benchmark/wasmboy/README.md

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+# WasmBoy
+
+<p align="center"><img width="50%" src="image.png"></p>
+
+To run WasmBoy, you need a Gameboy ROM file. For example, you can download [`tobudx.gb` (Tobu Tobu Girl ROM)](https://tangramgames.itch.io/tobu-tobu-girl-deluxe/purchase?popup=1)
+
+`wasm3.wasm` is a normal WASI build of Wasm3.
+
+### Run with Webassembly.sh
+
+Drag'n'drop `wasm3.wasm`, `wasmerboy.wasm`, `tobudx.gb` to [Webassembly.sh](https://webassembly.sh) and run:
+
+```sh
+wasm3 /tmp/wasmerboy.wasm /tmp/tobudx.gb
+```
+
+To speed it up (at your own risk, this disables security features):
+```sh
+chromium-browser --no-sandbox --js-flags="--wasm-opt --wasm-no-bounds-checks --wasm-no-stack-checks" "https://webassembly.sh"
+```
+
+### Run with Wasmer
+
+`TODO`
+
+### Also
+
+Check out [Aaron Turner's article on Wasmer and WasmBoy](https://medium.com/wasmer/wasmer-io-devices-announcement-6f2a6fe23081).

test/benchmark/wasmsynth/README.md

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+# Wasm Synth
+
+<p align="center"><img width="50%" src="image.png"></p>
+
+Here is some music created by [Peter Salomonsen](https://petersalomonsen.com/) in his [wasm music experiment](https://petersalomonsen.com/webassemblymusic/livecodev2/):
+
+- **Hondarribia (opening track from WASM summit 2020)**, `hondarribia.wasm` [SoundCloud](https://soundcloud.com/psalomo/hondarribia)
+- **WASM song**, `wasm-song.wasm` [SoundCloud](https://soundcloud.com/psalomo/wasm-song)
+- **Shuffle Chill**, `shuffle-chill.wasm` [SoundCloud](https://soundcloud.com/psalomo/shuffle-chill)
+- **"WebChip" music**, `webchip-music.wasm` [SoundCloud](https://soundcloud.com/psalomo/webchip-music)
+
+Check out Peter's [excellent talk on WebAssembly Summit 2020](https://www.youtube.com/watch?v=WZp0sPDvWfw&t=18670).
+
+### Running
+
+Generate a `wav` file:
+```
+wasm3 hondarribia.wasm | sox -S -t raw -b 32 -e float -r 44100 -c 2 - hondarribia.wav
+```
+
+Play live (choppy on most machines):
+```
+wasm3 hondarribia.wasm | sox -S -t raw -b 32 -e float -r 44100 -c 2 - -d
+```