Properly handle parsing a '%'-prefixed runtime call as a binding pattern

R=rossberg@chromium.org
BUG=chromium:552302
LOG=n

Review URL: https://codereview.chromium.org/1425723004

Cr-Commit-Position: refs/heads/master@{#31890}

src/preparser.h

@@ -2404,6 +2404,7 @@ ParserBase<Traits>::ParsePrimaryExpression(ExpressionClassifier* classifier,
 
     case Token::MOD:
       if (allow_natives() || extension_ != NULL) {
+        BindingPatternUnexpectedToken(classifier);
         return this->ParseV8Intrinsic(ok);
       }
       break;

test/mjsunit/regress/regress-552302.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: --harmony-destructuring --allow-natives-syntax
+
+assertThrows('var %OptimizeFunctionOnNextCall()', SyntaxError);