Fix 'combo breaker' in CreateDynamicFunction to handle template literals.

BUG=chromium:663410

Review-Url: https://codereview.chromium.org/2533463002
Cr-Commit-Position: refs/heads/master@{#41320}

src/builtins/builtins-function.cc

@@ -61,7 +61,7 @@ MaybeHandle<Object> CreateDynamicFunction(Isolate* isolate,
       // If the formal parameters include an unbalanced block comment, the
       // function must be rejected. Since JavaScript does not allow nested
       // comments we can include a trailing block comment to catch this.
-      builder.AppendCString("\n/**/");
+      builder.AppendCString("\n/*``*/");
     }
     builder.AppendCString(") {\n");
     if (argc > 0) {

test/mjsunit/regress-crbug-663410.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.
+
+function alert(x) {};
+assertThrows(
+  Function("a=`","`,xss=1){alert(xss)")
+);