[wasm] Set up Table and Memory constructors

test/mjsunit/wasm/unicode-validation.js

 // Copyright 2016 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 toByteArray(s) {
@@ skipping 61 matching lines @@
     ffi[imported_module_name][imported_function_name] = function() { };
   }
 
   var hasThrown = true;
   try {
     builder.instantiate(ffi);
     hasThrown = false;
   } catch (err) {
     if (!shouldThrow) print(err);
     assertTrue(shouldThrow, "Should not throw error on valid names");
+    assertTrue(err instanceof Error, "exception should be an Error");
     assertContains("UTF-8", err.toString());
   }
   assertEquals(shouldThrow, hasThrown,
       "Should throw validation error on invalid names");
 }
 
 function checkImportedModuleName(name, shouldThrow) {
   checkImportsAndExports(name, "imp", "func", undefined, shouldThrow);
 }
 
@@ skipping 20 matching lines @@
 checkAll("some math: (½)² = ¼", false);
 checkAll("中国历史系列条目\n北", false);
 checkAll(toByteArray("\xef\xb7\x8f"), false);
 checkAll(toByteArray("a\xc2\x81\xe1\x80\xbf\xf1\x80\xa0\xbf"), false);
 checkAll(toByteArray("\xff"), true);
 checkAll(toByteArray("\xed\xa0\x8f"), true);        // surrogate code points
 checkAll(toByteArray("\xe0\x82\x80"), true);        // overlong sequence
 checkAll(toByteArray("\xf4\x90\x80\x80"), true);    // beyond limit: U+110000
 checkAll(toByteArray("\xef\xbf\xbe"), true);        // non-character; U+FFFE
 checkAll(toByteArray("with\x00null"), false);