Store copied value rather than the original double.

R=danno@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23262002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16208 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -2231,7 +2231,7 @@ MaybeObject* JSObject::ConvertDescriptorToField(Name* name,
   if (new_properties != NULL) {
     set_properties(new_properties);
   }
-  FastPropertyAtPut(index, new_value);
+  FastPropertyAtPut(index, storage);
   return new_value;
 }
 

test/mjsunit/regress/regress-convert-function-to-double.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.
+
+function f(v) {
+  this.func = v;
+}
+
+var o1 = new f(f);
+var d = 1.4;
+var o2 = new f(d);
+o2.func = 1.8;
+assertEquals(1.4, d)