Ensure consistent error handling on 32b/64b platforms.

BUG=chromium:669017

Review-Url: https://codereview.chromium.org/2536783003
Cr-Commit-Position: refs/heads/master@{#41364}

src/parsing/scanner.cc

@@ -1152,7 +1152,8 @@ Token::Value Scanner::ScanNumber(bool seen_period) {
         }
 
         if (next_.literal_chars->one_byte_literal().length() <= 10 &&
-            value <= Smi::kMaxValue && c0_ != '.' && c0_ != 'e' && c0_ != 'E') {
+            value <= Smi::kMaxValue && c0_ != '.' &&
+            (c0_ == kEndOfInput || !unicode_cache_->IsIdentifierStart(c0_))) {
           next_.smi_value_ = static_cast<uint32_t>(value);
           literal.Complete();
           HandleLeadSurrogate();

test/message/regress/regress-crbug-669017.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.
+
+1073741824O0

test/message/regress/regress-crbug-669017.out

+# 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.
+
+*%(basename)s:5: SyntaxError: Invalid or unexpected token
+1073741824O0
+^^^^^^^^^^
+SyntaxError: Invalid or unexpected token