[wasm] Support undefined indirect table entries, behind a flag.

test/mjsunit/wasm/default-func-call.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
+// Flags: --wasm-jit-prototype
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 var module = (function () {
   var builder = new WasmModuleBuilder();
 
   var sig_index = builder.addSignature(kSig_i_ii);
   builder.addImport("add", sig_index);
   builder.addFunction("add", sig_index)
@@ skipping 19 matching lines @@
   return builder.instantiate({add: function(a, b) { return a + b | 0; }});
 })();
 
 // Check the module exists.
 assertFalse(module === undefined);
 assertFalse(module === null);
 assertFalse(module === 0);
 assertEquals("object", typeof module.exports);
 assertEquals("function", typeof module.exports.main);
 
-assertEquals(5, module.exports.main(1, 12, 7));
-assertEquals(19, module.exports.main(0, 12, 7));
-
-assertTraps(kTrapFuncSigMismatch, "module.exports.main(2, 12, 33)");
-assertTraps(kTrapFuncInvalid, "module.exports.main(3, 12, 33)");
+// Check that the appropriate trap is generated
+assertTraps(kTrapFuncInvalid, "module.exports.main(-1,15,16)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(100000,15,16)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(512,15,16)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(513,15,16)");
+assertTraps(kTrapDefaultFuncCall, "module.exports.main(511,15,16)");
+assertTraps(kTrapDefaultFuncCall, "module.exports.main(4,15,16)");
+assertTraps(kTrapDefaultFuncCall, "module.exports.main(3,15,16)");
+assertTraps(kTrapFuncSigMismatch, "module.exports.main(2,15,16)");