After transitioning to constant function, return the constant function as result of the assignment.

BUG=v8:2226
TEST=test/mjsunit/regress/regress-2226.js

Review URL: https://chromiumcodereview.appspot.com/10700137

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12024 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -2959,7 +2959,7 @@ MaybeObject* JSObject::SetPropertyForResult(LookupResult* result,
       // transition to the target map.
       if (constant_function == *value) {
         self->set_map(transition_map);
-        return this;
+        return constant_function;
       }
       // Otherwise, replace with a map transition to a new map with a FIELD,
       // even if the value is a constant function.

test/mjsunit/regress/regress-2226.js

+// Copyright 2012 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.
+
+var foo = function() { 0; /* foo function */ };
+var bar = function() { 1; /* bar function */ };
+var baz = function() { 2; /* baz function */ };
+
+var test = foo.test = bar.test = baz;
+
+assertEquals(baz, test);
+assertEquals(baz, foo.test);
+assertEquals(baz, bar.test);