Add fuzz target to fuzz wasm-to-IR conversion.

fuzz/.gitignore

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+
+target
+corpus
+artifacts

fuzz/Cargo.toml

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+
+[package]
+name = "waffle-fuzz"
+version = "0.0.0"
+authors = ["Automatically generated"]
+publish = false
+edition = "2018"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.3"
+wasm-smith = "0.8"
+
+[dependencies.waffle]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "parse_ir"
+path = "fuzz_targets/parse_ir.rs"
+test = false
+doc = false

fuzz/fuzz_targets/parse_ir.rs

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+#![no_main]
+use libfuzzer_sys::fuzz_target;
+
+use waffle::frontend::wasm_to_ir;
+use wasm_smith::Module;
+
+fuzz_target!(|module: Module| {
+    let _parsed_module = wasm_to_ir(module.to_bytes()).unwrap();
+});