Expose cranelift nan canonicalization config via C API (#4154)

* Add cranelift_nan_canonicalization to c api header

* Add cranelift_nan_canonicalization to capi/config.rs

* Fix func name

crates/c-api/include/wasmtime/config.h

@@ -213,6 +213,19 @@ WASMTIME_CONFIG_PROP(wasmtime_error_t*, strategy, wasmtime_strategy_t)
  */
 WASMTIME_CONFIG_PROP(void, cranelift_debug_verifier, bool)
 
+/**
+ * \brief Configures whether Cranelift should perform a NaN-canonicalization pass.
+ *
+ * When Cranelift is used as a code generation backend this will configure
+ * it to replace NaNs with a single canonical value. This is useful for users
+ * requiring entirely deterministic WebAssembly computation.
+ * 
+ * This is not required by the WebAssembly spec, so it is not enabled by default.
+ * 
+ * The default value for this is `false`
+ */
+WASMTIME_CONFIG_PROP(void, cranelift_nan_canonicalization, bool)
+
 /**
  * \brief Configures Cranelift's optimization level for JIT code.
  *

crates/c-api/src/config.rs

@@ -120,6 +120,14 @@ pub extern "C" fn wasmtime_config_cranelift_debug_verifier_set(
     c.config.cranelift_debug_verifier(enable);
 }
 
+#[no_mangle]
+pub extern "C" fn wasmtime_config_cranelift_nan_canonicalization_set(
+    c: &mut wasm_config_t,
+    enable: bool,
+) {
+    c.config.cranelift_nan_canonicalization(enable);
+}
+
 #[no_mangle]
 pub extern "C" fn wasmtime_config_cranelift_opt_level_set(
     c: &mut wasm_config_t,