Fix edge case in stack trace formatting.

Bug description: in strict mode, null as receiver is not implicitly converted
to the global object, so that when formatting the stack trace, the receiver of
the stack frame is null. The IS_OBJECT check returns true for null, but
%GetDataProperty expected a JSObject, which results in a failed RUNTIME_ASSERT.

R=mvstanton@chromium.org
BUG=237617

Review URL: https://chromiumcodereview.appspot.com/15670003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14797 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/messages.js

@@ -906,8 +906,8 @@ function CallSiteGetPosition() {
 
 function CallSiteIsConstructor() {
   var receiver = this[CallSiteReceiverKey];
-  var constructor =
-      IS_OBJECT(receiver) ? %GetDataProperty(receiver, "constructor") : null;
+  var constructor = (receiver != null && IS_OBJECT(receiver))
+                        ? %GetDataProperty(receiver, "constructor") : null;
   if (!constructor) return false;
   return this[CallSiteFunctionKey] === constructor;
 }

test/mjsunit/regress/regress-237617.js

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"use strict"
+
+function f() {
+  throw new Error("test stack");
+}
+
+var error_stack = "";
+try {
+  f.call(null);
+} catch (e) {
+  error_stack = e.stack;
+}
+
+assertTrue(error_stack.indexOf("test stack") > 0);
+assertTrue(error_stack.indexOf("illegal") < 0);
+