According to the ES5 spec the implementation of DefineOwnProperty() has
to special case handling of arrays. This is a preliminary implementation
correctly handling definition of array index properties, defining length
properties is not completely covered yet.

R=rossberg@chromium.org
TEST=test262

Review URL: http://codereview.chromium.org/8221002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9596 ce2b1a6d-e550-0410-aec6-3dcde31c8c00