[wasm] Fix ToNumber conversion

test/mjsunit/wasm/ffi-error.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --expose-wasm
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 function testCallFFI(ffi) {
@@ skipping 97 matching lines @@
       kExprI64SConvertI32,
       kExprCallFunction, index  // --
     ])        // --
     .exportFunc();
   var func = function() {return {};};
   var main = builder.instantiate({func: func}).exports.main;
   assertThrows(function() {
     main(13);
   }, TypeError);
 })();
+
+(function ImportSymbolToNumberThrows() {
+  var builder = new WasmModuleBuilder();
+  var index = builder.addImport("func", kSig_i_v);
+  builder.addFunction("main", kSig_i_v)
+      .addBody([kExprCallFunction, 0])
+      .exportFunc();
+  var func = () => Symbol();
+  var main = builder.instantiate({func: func}).exports.main;
+  assertThrows(() => main(), TypeError);
+})();