wasm-mutate fuzz targets (#3836)

* fuzzing: Add a custom mutator based on `wasm-mutate`

* fuzz: Add a version of the `compile` fuzz target that uses `wasm-mutate`

* Update `wasmparser` dependencies

crates/wasmtime/Cargo.toml

@@ -20,7 +20,7 @@ wasmtime-cache = { path = "../cache", version = "=0.34.0", optional = true }
 wasmtime-fiber = { path = "../fiber", version = "=0.34.0", optional = true }
 wasmtime-cranelift = { path = "../cranelift", version = "=0.34.0", optional = true }
 target-lexicon = { version = "0.12.0", default-features = false }
-wasmparser = "0.82"
+wasmparser = "0.83.0"
 anyhow = "1.0.19"
 region = "2.2.0"
 libc = "0.2"

crates/wasmtime/src/module/serialization.rs

@@ -98,6 +98,11 @@ impl From<&wasmparser::WasmFeatures> for WasmFeatures {
             memory64,
             relaxed_simd,
             extended_const,
+
+            // Always on; we don't currently have knobs for these.
+            mutable_global: _,
+            saturating_float_to_int: _,
+            sign_extension: _,
         } = *other;
 
         Self {