[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.
+//

[bradn, 2016/06/16 08:00:20]

Extra line.
Maybe in a separate file?

 // 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-prototpe
 
 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 24 matching lines @@
 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)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(4, 12, 33)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(1023, 12, 33)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(1025, 12, 33)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(2048, 12, 33)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(511, 12, 33)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(513, 12, 33)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(-1, 12, 33)");