Re-reland "More tests for Union & Intersect"

R=jarin@chromium.org
BUG=

Review URL: https://codereview.chromium.org/237143002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20733 ce2b1a6d-e550-0410-aec6-3dcde31c8c00