[compiler] Bytecode preparation fails for asm.js modules.

This handles the case where preparation of bytecode might fail inside
Compiler::EnsureBytecode due to the underlying function being a fully
validated asm.js module. We simply bailout of bytecode preparation.

R=bradnelson@chromium.org
TEST=mjsunit/regress/regress-crbug-644111
BUG=chromium:644111

Review-Url: https://codereview.chromium.org/2309853002
Cr-Commit-Position: refs/heads/master@{#39187}

src/compiler.cc

@@ -1336,6 +1336,7 @@ bool Compiler::EnsureBytecode(CompilationInfo* info) {
   if (!info->shared_info()->HasBytecodeArray()) {
     Handle<Code> original_code(info->shared_info()->code());
     if (GetUnoptimizedCode(info).is_null()) return false;
+    if (info->shared_info()->HasAsmWasmData()) return false;
     DCHECK(info->shared_info()->is_compiled());
     if (original_code->kind() == Code::FUNCTION) {
       // Generating bytecode will install the {InterpreterEntryTrampoline} as

test/mjsunit/regress/regress-crbug-644111.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: --ignition-staging --turbo --validate-asm --always-opt
+
+function Module() {
+  "use asm";
+  return {};
+}
+var m = Module();